Efficiency and Stability of p-i-n Type Organic Light Emitting Diodes for Display and Lighting Applications

Recent advances in the field of p-i-n type organic light emitting diodes (OLEDs) are reviewed. OLEDs are energy efficient light sources, which will be used in the near future in commercial display and lighting applications. In particular, p-i-n type OLEDs consisting of doped charge transport layers and intrinsic emission layers have been very successful in reducing the operational voltages and increasing the power efficiency. After shortly introducing the p-i-n concept, the advantages of this concept in terms of low operating voltages, high power efficiency and long lifetime are described. In particular, the latest reports on monochrome, white, and top-emission p-i-n OLEDs are summarized.

[1]  T. Nakayama,et al.  Development of Phosphorescent White OLED with High Power Efficiency and Long Lifetime , 2008 .

[2]  Yi Zhao,et al.  Efficient white organic light-emitting devices using 4,7-diphenyl-1,10-phenanthroline as block layer , 2007 .

[3]  Stephen R. Forrest,et al.  A low drive voltage, transparent, metal-free n-i-p electrophosphorescent light emitting diode , 2003 .

[4]  Ananth Dodabalapur,et al.  Efficiency enhancement of microcavity organic light emitting diodes , 1996 .

[5]  Stephen R. Forrest,et al.  Management of singlet and triplet excitons for efficient white organic light-emitting devices , 2006, Nature.

[6]  Jingsong Huang,et al.  White light emission induced by confinement in organic multiheterostructures , 1999 .

[7]  Toshio Matsumoto,et al.  Bright organic electroluminescent devices having a metal-doped electron-injecting layer , 1998 .

[8]  Eugene Kim,et al.  Inverted top-emitting organic light-emitting diodes using transparent conductive NiO electrode , 2005 .

[9]  K. Walzer,et al.  Influence of charge balance and exciton distribution on efficiency and lifetime of phosphorescent organic light-emitting devices , 2008 .

[10]  Stephen R. Forrest,et al.  Efficient Organic Electrophosphorescent White‐Light‐Emitting Device with a Triple Doped Emissive Layer , 2004 .

[11]  R. Stephenson.  A and V , 1962, The British journal of ophthalmology.

[12]  M. Wong,et al.  Efficient organic light-emitting diode using semitransparent silver as anode , 2005 .

[13]  J.N. Bardsley,et al.  International OLED technology roadmap , 2004, IEEE Journal of Selected Topics in Quantum Electronics.

[14]  Stephen R. Forrest,et al.  White Organic Light‐Emitting Devices for Solid‐State Lighting , 2004 .

[15]  Heike Riel,et al.  Phosphorescent top-emitting organic light-emitting devices with improved light outcoupling , 2003 .

[16]  Henri Benisty,et al.  High-efficiency semiconductor resonant-cavity light-emitting diodes: a review , 2002 .

[17]  C. Tang,et al.  Organic Electroluminescent Diodes , 1987 .

[18]  K. Walzer,et al.  Highly efficient deep-blue organic light-emitting diodes with doped transport layers , 2005 .

[19]  Katsutoshi Nagai,et al.  White light‐emitting organic electroluminescent devices using the poly(N‐vinylcarbazole) emitter layer doped with three fluorescent dyes , 1994 .

[20]  Frank Nüesch,et al.  Water Vapor and Oxygen Degradation Mechanisms in Organic Light Emitting Diodes , 2001 .

[21]  H. Chan,et al.  Investigation of the sites of dark spots in organic light-emitting devices , 2000 .

[22]  Jan Birnstock,et al.  High-efficiency and low-voltage p‐i‐n electrophosphorescent organic light-emitting diodes with double-emission layers , 2004 .

[23]  Katsutoshi Nagai,et al.  Multilayer White Light-Emitting Organic Electroluminescent Device , 1995, Science.

[24]  Donal D. C. Bradley,et al.  Angular Dependence of the Emission from a Conjugated Polymer Light‐Emitting Diode: Implications for efficiency calculations , 1994 .

[25]  Tetsuo Tsutsui,et al.  Organic light-emitting device with an ordered monolayer of silica microspheres as a scattering medium , 2000 .

[26]  Brian D'Andrade,et al.  Phosphorescent organic light-emitting devices for solid-state lighting , 2005, SPIE Optics + Photonics.

[27]  Ho Won Choi,et al.  Enhancement of electron injection in inverted top-emitting organic light-emitting diodes using an insulating magnesium oxide buffer layer , 2005 .

[28]  Y. Duan,et al.  Extremely low voltage and high bright p-i-n fluorescent white organic light-emitting diodes , 2008 .

[29]  T. Marks.  Electrically Conductive Metallomacrocyclic Assemblies , 1985, Science.

[30]  Bernard Geffroy,et al.  Microcavity organic light-emitting diodes on silicon , 2002 .

[31]  J. Jou,et al.  Color-stable, efficient fluorescent pure-white organic light-emitting diodes with device architecture preventing excessive exciton formation on guest , 2008 .

[32]  Xiang Zhou,et al.  Low-voltage inverted transparent vacuum deposited organic light-emitting diodes using electrical doping , 2002 .

[33]  Wenqing Zhu,et al.  RGB tricolor produced by white-based top-emitting organic light-emitting diodes with microcavity structure , 2007 .

[34]  S. Chua,et al.  Bubble formation due to electrical stress in organic light emitting devices , 2002 .

[35]  Beat Ruhstaller,et al.  Thickness-dependent changes in the optical properties of PPV- and PF-based polymer light emitting diodes , 2003 .

[36]  Yasunori Taga,et al.  Design of multiwavelength resonant cavities for white organic light-emitting diodes , 2003 .

[37]  Stephen R. Forrest,et al.  Organic light emitting devices with enhanced outcoupling via microlenses fabricated by imprint lithography , 2006 .

[38]  Geun Young Yeom,et al.  Four-wavelength white organic light-emitting diodes using 4,4′-bis-[carbazoyl-(9)]-stilbene as a deep blue emissive layer , 2007 .

[39]  Joseph John Shiang,et al.  Organic light-emitting devices for illumination quality white light , 2002 .

[40]  Charles E. Swenberg,et al.  Electronic Processes in Organic Crystals and Polymers , 1999 .

[41]  H. Bässler,et al.  A model of weak-field quasi-equilibrium hopping transport in disordered materials , 1993 .

[42]  Stephen R. Forrest,et al.  Enhanced light out-coupling of organic light-emitting devices using embedded low-index grids , 2008 .

[43]  C. M. Elliott,et al.  Organic homojunction diodes with a high built-in potential: interpretation of the current-voltage characteristics by a generalized Einstein relation. , 2005, Physical review letters.

[44]  Joseph Shinar,et al.  Bright white small molecular organic light-emitting devices based on a red-emitting guest–host layer and blue-emitting 4,4′-bis(2,2′-diphenylvinyl)-1,1′-biphenyl , 2002 .

[45]  C. Tang.  Two‐layer organic photovoltaic cell , 1986 .

[46]  Peipei Sun,et al.  New Iridium Complexes as Highly Efficient Orange–Red Emitters in Organic Light‐Emitting Diodes , 2003 .

[47]  Y. Duan,et al.  White organic light-emitting devices employing phosphorescent iridium complex as RGB dopants , 2007 .

[48]  Stephen R. Forrest,et al.  EXCITONIC SINGLET-TRIPLET RATIO IN A SEMICONDUCTING ORGANIC THIN FILM , 1999 .

[49]  Yu-Tai Tao,et al.  White organic light-emitting diodes based on 2,7-bis(2,2-diphenylvinyl)-9,9 ' -spirobifluorene: Improvement in operational lifetime , 2004 .

[50]  Chihaya Adachi,et al.  100% phosphorescence quantum efficiency of Ir(III) complexes in organic semiconductor films , 2005 .

[51]  K. Walzer,et al.  53.3: Influence of Material Purification by Vacuum Sublimation on Organic Optoelectronic Device Performance , 2006 .

[52]  Stephen R. Forrest,et al.  Phosphorescent materials for application to organic light emitting devices , 1999 .

[53]  Tomoyuki Nakayama,et al.  19.1: Invited Paper: Development of Phosphorescent White OLED with Extremely High Power Efficiency and Long Lifetime , 2007 .

[54]  V. Roy,et al.  Efficient White Organic Light‐Emitting Devices Based on Phosphorescent Platinum(II)/Fluorescent Dual‐Emitting Layers , 2007 .

[55]  Dashan Qin,et al.  White organic light-emitting diode comprising of blue fluorescence and red phosphorescence , 2005 .

[56]  Chunliang Lin,et al.  Microcavity two-unit tandem organic light-emitting devices having a high efficiency , 2006 .

[57]  Chi-Feng Lin,et al.  Driving voltage reduction in white organic light-emitting devices from selectively doping in ambipolar blue-emitting layer , 2007 .

[58]  Kristiaan Neyts.  Microcavity effects and the outcoupling of light in displays and lighting applications based on thin emitting films , 2005 .

[59]  Stephen R. Forrest,et al.  White-light-emitting organic electroluminescent devices based on interlayer sequential energy transfer , 1999 .

[60]  C. L. Mulder,et al.  Saturated and efficient blue phosphorescent organic light emitting devices with Lambertian angular emission , 2007 .

[61]  Josef Salbeck,et al.  White Light Emission from Organic LEDs Utilizing Spiro Compounds with High‐Temperature Stability , 2000 .

[62]  Junsheng Yu,et al.  Bright White Organic Light-Emitting Diode Mixed Blue and Green Emission , 2008 .

[63]  17.5L: Late‐News Paper: Novel Host Materials for Efficient and Stable Phosphorescent OLED Devices , 2004 .

[64]  M. Hashimoto,et al.  Substituent effects of iridium complexes for highly efficient red OLEDs. , 2005, Dalton transactions.

[65]  K. Leo,et al.  Controlled n-type doping of a molecular organic semiconductor: Naphthalenetetracarboxylic dianhydride (NTCDA) doped with bis(ethylenedithio)-tetrathiafulvalene (BEDT-TTF) , 2000 .

[66]  Antoine Kahn,et al.  Controlled p-doping of zinc phthalocyanine by coevaporation with tetrafluorotetracyanoquinodimethane: A direct and inverse photoemission study , 2001 .

[67]  Walter Riess,et al.  Simulating electronic and optical processes in multilayer organic light-emitting devices , 2003 .

[68]  Fumio Sato,et al.  High-efficiency white phosphorescent organic light-emitting devices with greenish-blue and red-emitting layers , 2003 .

[69]  S. Forrest,et al.  Nearly 100% internal phosphorescence efficiency in an organic light emitting device , 2001 .

[70]  Stephen R. Forrest,et al.  White Light Emission Using Triplet Excimers in Electrophosphorescent Organic Light‐Emitting Devices , 2002 .

[71]  Chieh-Wei Chen,et al.  An effective cathode structure for inverted top-emitting organic light-emitting devices , 2004 .

[72]  K. Leo,et al.  High-efficiency monochrome organic light emitting diodes employing enhanced microcavities , 2008 .

[73]  Wolfgang Kowalsky,et al.  Inverted top-emitting organic light-emitting diodes using sputter-deposited anodes , 2003 .

[74]  Gregor Schwartz,et al.  Highly efficient white organic light emitting diodes comprising an interlayer to separate fluorescent and phosphorescent regions , 2006 .

[75]  Herbert Friedrich Boerner.  OLEDs for lighting , 2006, SPIE Photonics Europe.

[76]  Lewis J. Rothberg,et al.  Color variation with electroluminescent organic semiconductors in multimode resonant cavities , 1994 .

[77]  Martin Pfeiffer,et al.  Interface electronic structure of organic semiconductors with controlled doping levels , 2001 .

[78]  Karsten Walzer,et al.  Ultrastable and efficient red organic light emitting diodes with doped transport layers , 2006 .

[79]  Stephen R. Forrest,et al.  High efficiency single dopant white electrophosphorescent light emitting diodesElectronic supplementary information (ESI) available: emission spectra as a function of doping concentration for 3 in CBP, as well as the absorption and emission spectra of Irppz, CBP and mCP. See http://www.rsc.org/suppd , 2002 .

[80]  G. Gigli,et al.  White light emission from blends of blue-emitting organic molecules: A general route to the white organic light-emitting diode? , 2001 .

[81]  Dashan Qin,et al.  Increased electrophosphorescent efficiency in organic light emitting diodes by using an exciton-collecting structure , 2005 .

[82]  Gregor Schwartz,et al.  High-efficiency white organic-light-emitting diodes combining fluorescent and phosphorescent emitter systems , 2006, SPIE Photonics Europe.

[83]  Young Kwan Kim,et al.  Study on electrical characteristics of organic electrophosphorescent devices based on new Ir complex , 2004 .

[84]  Fumio Sato,et al.  Confinement of triplet energy on phosphorescent molecules for highly-efficient organic blue-light-emitting devices , 2003 .

[85]  Martin H. P. Pfeiffer,et al.  Highly efficient organic light emitting diodes (OLED) for diplays and lighting , 2006, SPIE Photonics Europe.

[86]  M. Wong,et al.  High-Performance Top-Emitting White Organic Light-Emitting Devices , 2007 .

[87]  Xiaoping Zhou,et al.  Enhanced Hole Injection into Amorphous Hole-Transport Layers of Organic Light-Emitting Diodes Using Controlled p-Type Doping , 2001 .

[88]  J. Sturm,et al.  Optimization of external coupling and light emission in organic light-emitting devices: modeling and experiment , 2002 .

[89]  Jan Birnstock,et al.  64.4: Novel Materials and Structures for Highly‐Efficient, Temperature‐Stable, and Long‐Living AM OLED Displays , 2006 .

[90]  Jan Kalinowski,et al.  Mixing of Excimer and Exciplex Emission: A New Way to Improve White Light Emitting Organic Electrophosphorescent Diodes , 2007 .

[91]  Russell J. Holmes,et al.  Excitonic singlet-triplet ratios in molecular and polymeric organic materials , 2003 .

[92]  Stephen R. Forrest,et al.  Effects of exciton and charge confinement on the performance of white organic p−i−n electrophosphorescent emissive excimer devices , 2003 .

[93]  H. Bässler.  Charge Transport in Disordered Organic Photoconductors a Monte Carlo Simulation Study , 1993 .

[94]  Ching Wan Tang,et al.  Interface engineering in preparation of organic surface-emitting diodes , 1999 .

[95]  G. Yeom,et al.  High Efficiency White Organic Light-Emitting Diodes from One Emissive Layer , 2007 .

[96]  Giuseppe Gigli,et al.  Organic single-layer white light-emitting diodes by exciplex emission from spin-coated blends of blue-emitting molecules , 2003 .

[97]  C. Chen,et al.  Recent development of blue fluorescent OLED materials and devices , 2005, Journal of Display Technology.

[98]  Hany Aziz,et al.  Degradation Phenomena in Small-Molecule Organic Light-Emitting Devices , 2004 .

[99]  Chung-Chih Wu,et al.  Enhancing light outcoupling of organic light-emitting devices by locating emitters around the second antinode of the reflective metal electrode , 2006 .

[100]  S. Forrest,et al.  Reliability and degradation of organic light emitting devices , 1994 .

[101]  C. Tang,et al.  Application of an ultrathin LiF/Al bilayer in organic surface-emitting diodes , 2001 .

[102]  S. Forrest,et al.  A Full‐Color Transparent Metal‐Free Stacked Organic Light Emitting Device with Simplified Pixel Biasing , 1999 .

[103]  Chieh-Wei Chen,et al.  Top-emitting organic light-emitting devices using surface-modified Ag anode , 2003 .

[104]  S. Forrest,et al.  Highly efficient phosphorescent emission from organic electroluminescent devices , 1998, Nature.

[105]  Jan Birnstock,et al.  High‐efficiency p‐i‐n organic light‐emitting diodes with long lifetime , 2005 .

[106]  Hoi Sing Kwok,et al.  A yellow-emitting iridium complex for use in phosphorescent multiple-emissive-layer white organic light-emitting diodes with high color quality and efficiency , 2008 .

[107]  S. Forrest,et al.  High-efficiency top-emissive white-light-emitting organic electrophosphorescent devices , 2005 .

[108]  Tomohiko Mori,et al.  Electronic structure of 8-hydroxyquinoline aluminum/LiF/Al interface for organic electroluminescent device studied by ultraviolet photoelectron spectroscopy , 1998 .

[109]  Jwo-Huei Jou,et al.  Nanodot‐Enhanced High‐Efficiency Pure‐White Organic Light‐Emitting Diodes with Mixed‐Host Structures , 2008 .

[110]  K. Walzer,et al.  Highly efficient organic devices based on electrically doped transport layers. , 2007, Chemical reviews.

[111]  G. Yeom,et al.  White top-emitting organic light-emitting diodes using one-emissive layer of the DCJTB doped DPVBi layer , 2008 .

[112]  S. Tokito,et al.  Precise Measurement of External Quantum Efficiency of Organic Light-Emitting Devices , 2004 .

[113]  Chang-Sik Ha,et al.  Accelerated pre-oxidation method for healing progressive electrical short in organic light-emitting devices , 2003 .

[114]  J. Simon,et al.  Molecular material based junctions: formation of a Schottky contact with metallophthalocyanine thin films doped by the cosublimation method , 1986 .

[115]  H. Antoniadis,et al.  Formation and growth of black spots in organic light‐emitting diodes , 1996 .

[116]  Wei Wang,et al.  Bubble formation and growth in organic light-emitting diodes composed of a polymeric emitter and a calcium cathode , 2002 .

[117]  Shiyong Liu,et al.  Top-emitting organic light-emitting devices with improved light outcoupling and angle-independence , 2006 .

[118]  Feng Li,et al.  White organic light-emitting devices using a phosphorescent sensitizer , 2003 .

[119]  Xue-Yin Jiang,et al.  MoOx modified Ag anode for top-emitting organic light-emitting devices , 2006 .

[120]  Stephen R. Forrest,et al.  Controlling Exciton Diffusion in Multilayer White Phosphorescent Organic Light Emitting Devices , 2002 .

[121]  R. Friend,et al.  Optical spectroscopy of triplet excitons and charged excitations in poly(p-phenylenevinylene) light-emitting diodes , 1993 .

[122]  Xiaoyuan Hou,et al.  Bubble formation in organic light-emitting diodes , 2000 .

[123]  Xiang Zhou,et al.  Doped organic semiconductors: Physics and application in light emitting diodes , 2003 .

[124]  Gregor Schwartz,et al.  Harvesting Triplet Excitons from Fluorescent Blue Emitters in White Organic Light‐Emitting Diodes , 2007 .

[125]  Atanasiu Constantin Bogdan,et al.  Electricity Consumption and Efficiency Trends in the Enlarged European Union - Status Report 2006- , 2007 .

[126]  Mei-Rurng Tseng,et al.  Efficient, long-life and Lambertian source of top-emitting white OLEDs using low-reflectivity molybdenum anode and co-doping technology , 2008 .

[127]  Martin Pfeiffer,et al.  LOW VOLTAGE ORGANIC LIGHT EMITTING DIODES FEATURING DOPED PHTHALOCYANINE AS HOLE TRANSPORT MATERIAL , 1998 .

[128]  R. Friend,et al.  Identification of a quenching species in ruthenium tris-bipyridine electroluminescent devices. , 2006, Journal of the American Chemical Society.

[129]  Xiang Zhou,et al.  High-efficiency electrophosphorescent organic light-emitting diodes with double light-emitting layers , 2002 .

[130]  Gregor Schwartz,et al.  Reduced efficiency roll-off in high-efficiency hybrid white organic light-emitting diodes , 2008 .

[131]  Klaus Meerholz,et al.  Outsmarting Waveguide Losses in Thin‐Film Light‐Emitting Diodes , 2001 .

[132]  Stephen R. Forrest,et al.  A metal-free cathode for organic semiconductor devices , 1998 .

[133]  Ching-Kun Chen,et al.  Novel carbazole/fluorene hybrids: host materials for blue phosphorescent OLEDs. , 2006, Organic letters.

[134]  Stephen R. Forrest,et al.  Electrophosphorescent p–i–n Organic Light‐Emitting Devices for Very‐High‐Efficiency Flat‐Panel Displays , 2002 .

[135]  P. Chou,et al.  In Search of High‐Performance Platinum(II) Phosphorescent Materials for the Fabrication of Red Electroluminescent Devices , 2005 .

[136]  Stephen R. Forrest,et al.  Ultrathin Organic Films Grown by Organic Molecular Beam Deposition and Related Techniques. , 1997, Chemical reviews.

[137]  Gang Li,et al.  Combinatorial fabrication and studies of bright white organic light-emitting devices based on emission from rubrene-doped 4,4′-bis(2,2′-diphenylvinyl)-1,1′-biphenyl , 2003 .

[138]  R. N. Marks,et al.  Light-emitting diodes based on conjugated polymers , 1990, Nature.

[139]  Jwo-Huei Jou,et al.  High-efficiency white organic light-emitting devices with dual doped structure , 2002 .

[140]  A. Beyer,et al.  Controlled p-doping of pigment layers by cosublimation: Basic mechanisms and implications for their use in organic photovoltaic cells , 2000 .

[141]  Donal D. C. Bradley,et al.  Conjugated polymer electroluminescence , 1993 .

[142]  Shih-Feng Hsu,et al.  Highly efficient top-emitting white organic electroluminescent devices , 2005 .

[143]  Chih-Hung Tsai,et al.  Highly Efficient, Deep‐Blue Doped Organic Light‐Emitting Devices , 2005 .

[144]  Martin Pfeiffer,et al.  Highly efficient top emitting organic light-emitting diodes with organic outcoupling enhancement layers , 2006 .

[145]  William C. Lenhart,et al.  Operational degradation of organic light-emitting diodes: Mechanism and identification of chemical products , 2007 .

[146]  A. Dodabalapur,et al.  Microcavity effects in organic semiconductors , 1994 .

[147]  Bogdan Atanasiu,et al.  Electricity Consumption and Efficiency Trends in the Enlarged , 2007 .

[148]  S. Forrest,et al.  Enhanced outcoupling from organic light-emitting diodes using aperiodic dielectric mirrors , 2007 .

[149]  Yi Zhao,et al.  High-performance white organic light-emitting device using non-doped-type structure , 2008 .