Green fluorescent organic light-emitting device with external quantum efficiency of nearly 10%

Green fluorescent organic light-emitting device (OLED) exhibiting a high external quantum efficiency of nearly 10% has been developed. The OLED consists of simple three organic layers, using NPB, 0.8% C545T doped TPBA, and DBzA as a hole-transporting layer, an emitting layer, and an electron-transporting layer, respectively, [fluorocarbon coated indium tin oxide/NPB (60 nm)/08% C545T doped TPBA (40 nm)/DBzA (20 nm)/LiF (1 nm/Al], where NPB is 4,4′-bis (N-phenyl-1-naphthylamino)biphenyl, C545T is 10-(2-benzothiazolyl)-1,1,7,7-tetramethyl-2,3,6,7-tetrahydro-1H,5H,11H-benzo[l]pyrano[6 7 8-ij]quinolizin-11-one, TPBA is 9,9′,10,10′-tetraphenyl-2,2′-bianthracene, and DBzA is 9,10-bis[4-(6-methylbenzothiazol-2-yl)phenyl]anthracene. The high external quantum efficiency is maintained in the wide range of current density of 2–100 mA∕cm2. The current efficiency and power efficiency of the OLED are also very high, 29.8 cd/A and 26.2 lm/W, respectively, at a current density of 20 mA/cm2. The OLED is promising for prac...

[1]  Stephen R. Forrest,et al.  Endothermic energy transfer: A mechanism for generating very efficient high-energy phosphorescent emission in organic materials , 2001 .

[2]  Yong Cao,et al.  Improved quantum efficiency for electroluminescence in semiconducting polymers , 1999, Nature.

[3]  M. Sinclair,et al.  Electron and hole mobility in tris(8‐hydroxyquinolinolato‐N1,O8) aluminum , 1995 .

[4]  Jian Li,et al.  Efficient, deep-blue organic electrophosphorescence by guest charge trapping , 2003 .

[5]  W. Helfrich,et al.  Transients of Volume‐Controlled Current and of Recombination Radiation in Anthracene , 1966 .

[6]  N. Ueno,et al.  Molecular Orientation and Aggregation of Titanyl Phthalocyanine Molecules on Graphite Substrates: Effects of Surface Topography of the Substrate , 2001 .

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

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

[9]  B. Tang,et al.  Highly efficient organic light-emitting diodes with a silole-based compound , 2002 .

[10]  David Vaufrey,et al.  Physical mechanism responsible for the stretched exponential decay behavior of aging organic light-emitting diodes , 2005 .

[11]  Ching Wan Tang,et al.  Efficient green organic light-emitting diodes with stericly hindered coumarin dopants , 2001 .

[12]  T. Mizutani,et al.  Carrier Transport and Carrier Trap of 8-Hydroxyquinoline Aluminium Thin Films , 1995 .

[13]  Tetsuo Tsutsui,et al.  Progress in Electroluminescent Devices Using Molecular Thin Films , 1997 .

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

[15]  A. S. Dhoot,et al.  Spin-dependent exciton formation in π-conjugated compounds , 2001, Nature.

[16]  S. Pantelides,et al.  Atomic dynamics and defect evolution during oxygen precipitation and oxidation of silicon , 1999 .

[17]  Franco Cacialli,et al.  Molecular-scale interface engineering for polymer light-emitting diodes , 2000, Nature.

[18]  Stephen R. Forrest,et al.  Improved energy transfer in electrophosphorescent devices , 1999 .

[19]  M. G. Mason,et al.  Anode modification in organic light-emitting diodes by low-frequency plasma polymerization of CHF3 , 2001 .

[20]  Y. Hamada,et al.  High efficiency red organic light-emitting devices using tetraphenyldibenzoperiflanthene-doped rubrene as an emitting layer , 2006 .