High‐Efficiency Fluorescent Organic Light‐Emitting Devices Using Sensitizing Hosts with a Small Singlet–Triplet Exchange Energy

Materials with small singlet-triplet splits (ΔEST s) are introduced as sensitizing hosts to excite fluorescent dopants, breaking the trade-off between small ΔEST and high radiative decay rates. A highly efficient orange-fluorescent organic light-emitting diode (OLED) is prepared, showing a maximum external quantum efficiency of 12.2%.

[1]  Jing Wang,et al.  Novel Efficient Blue Fluorophors with Small Singlet‐Triplet Splitting: Hosts for Highly Efficient Fluorescence and Phosphorescence Hybrid WOLEDs with Simplified Structure , 2013, Advanced materials.

[2]  H. Aziz,et al.  Correlation Between Triplet–Triplet Annihilation and Electroluminescence Efficiency in Doped Fluorescent Organic Light‐Emitting Devices , 2010 .

[3]  Stephen R. Forrest,et al.  High-efficiency yellow double-doped organic light-emitting devices based on phosphor-sensitized fluorescence , 2001 .

[4]  Junji Kido,et al.  Fabrication of highly efficient organic electroluminescent devices , 1998 .

[5]  Xiuqi Huang,et al.  Controlling the Recombination Zone of White Organic Light‐Emitting Diodes with Extremely Long Lifetimes , 2011 .

[6]  J. Shyue,et al.  Highly efficient orange-red phosphorescent organic light-emitting diode using 2,7-bis(carbazo-9-yl)-9,9-ditolyfluorene as the host , 2010 .

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

[8]  C. Adachi,et al.  Highly efficient organic light-emitting diodes by delayed fluorescence , 2013 .

[9]  J. Kido,et al.  Bisanthracene‐Based Donor–Acceptor‐type Light‐Emitting Dopants: Highly Efficient Deep‐Blue Emission in Organic Light‐Emitting Devices , 2014 .

[10]  Atsushi Kawada,et al.  Organic luminescent molecule with energetically equivalent singlet and triplet excited states for organic light-emitting diodes. , 2013, Physical review letters.

[11]  T. Voorhis,et al.  Extrafluorescent electroluminescence in organic light-emitting devices. , 2007, Nature materials.

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

[13]  Atsushi Kawada,et al.  Efficient up-conversion of triplet excitons into a singlet state and its application for organic light emitting diodes , 2011 .

[14]  Liduo Wang,et al.  Extremely low driving voltage electrophosphorescent green organic light-emitting diodes based on a host material with small singlet–triplet exchange energy without p- or n-doping layer , 2013 .

[15]  C. Adachi,et al.  Efficient blue organic light-emitting diodes employing thermally activated delayed fluorescence , 2014, Nature Photonics.

[16]  A. Monkman,et al.  Ultrahigh Efficiency Fluorescent Single and Bi‐Layer Organic Light Emitting Diodes: The Key Role of Triplet Fusion , 2013 .

[17]  Daisuke Yokoyama,et al.  Thermally Activated Delayed Fluorescence from Sn4+–Porphyrin Complexes and Their Application to Organic Light Emitting Diodes — A Novel Mechanism for Electroluminescence , 2009, Advanced materials.

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

[19]  C. Adachi,et al.  Highly Efficient Organic Light‐Emitting Diode Based on a Hidden Thermally Activated Delayed Fluorescence Channel in a Heptazine Derivative , 2013, Advanced materials.

[20]  P. Magnante,et al.  Electroluminescence in Organic Crystals , 1963 .

[21]  C. Adachi,et al.  Enhanced electroluminescence efficiency in a spiro-acridine derivative through thermally activated delayed fluorescence. , 2012, Angewandte Chemie.

[22]  Zhuozhi Wang,et al.  Chlorinated Indium Tin Oxide Electrodes with High Work Function for Organic Device Compatibility , 2011, Science.

[23]  Jun Yeob Lee,et al.  Organic Materials for Deep Blue Phosphorescent Organic Light‐Emitting Diodes , 2012, Advanced materials.

[24]  Stephen R. Forrest,et al.  Quantum efficiency roll-off at high brightness in fluorescent and phosphorescent organic light emitting diodes , 2008 .

[25]  Donal D. C. Bradley,et al.  Efficient Energy Transfer from Blue to Red in Tetraphenylporphyrin‐Doped Poly(9,9‐dioctylfluorene) Light‐Emitting Diodes , 2000 .

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

[27]  Junji Kido,et al.  Ultra High Efficiency Green Organic Light-Emitting Devices , 2006 .

[28]  S. R. Forrest,et al.  High-efficiency fluorescent organic light-emitting devices using a phosphorescent sensitizer , 2000, Nature.

[29]  Tukaram K. Hatwar,et al.  Triplet annihilation exceeding spin statistical limit in highly efficient fluorescent organic light-emitting diodes , 2009 .

[30]  Martin R. Bryce,et al.  Triplet Harvesting with 100% Efficiency by Way of Thermally Activated Delayed Fluorescence in Charge Transfer OLED Emitters , 2013, Advanced materials.

[31]  Chihaya Adachi,et al.  Organic light-emitting diodes employing efficient reverse intersystem crossing for triplet-to-singlet state conversion , 2012, Nature Photonics.

[32]  J. Shinar,et al.  Transient electroluminescence spikes in small molecular organic light-emitting diodes , 2011 .

[33]  Jang‐Joo Kim,et al.  Efficient triplet harvesting by fluorescent molecules through exciplexes for high efficiency organic light-emitting diodes , 2013 .

[34]  Ching Wan Tang,et al.  Recent developments in molecular organic electroluminescent materials , 1997 .

[35]  Chihaya Adachi,et al.  Efficient green thermally activated delayed fluorescence (TADF) from a phenoxazine-triphenyltriazine (PXZ-TRZ) derivative. , 2012, Chemical communications.

[36]  Yong Qiu,et al.  Strategies to Design Bipolar Small Molecules for OLEDs: Donor‐Acceptor Structure and Non‐Donor‐Acceptor Structure , 2011, Advanced materials.

[37]  Manuel A. Palacios,et al.  Ultrafast energy transfer in oligofluorene-aluminum bis(8-hydroxyquinoline)acetylacetone coordination polymers. , 2009, Journal of the American Chemical Society.

[38]  Yuguang Ma,et al.  Employing ∼100% Excitons in OLEDs by Utilizing a Fluorescent Molecule with Hybridized Local and Charge‐Transfer Excited State , 2014 .

[39]  S. Forrest,et al.  Enhanced efficiency in high-brightness fluorescent organic light emitting diodes through triplet management , 2011 .