TITLE

Sharp green electroluminescence from 1H-pyrazolo[3,4-b]quinoline-based light-emitting diodes

AUTHOR(S)
Tao, Y. T.; Tao, Y.T.; Balasubramaniam, E.; Danel, A.; Jarosz, B.; Tomasik, P.
PUB. DATE
September 2000
SOURCE
Applied Physics Letters;9/11/2000, Vol. 77 Issue 11
SOURCE TYPE
Academic Journal
DOC. TYPE
Article
ABSTRACT
A multilayer organic light-emitting diode was fabricated using a fluorescent compound {6-N,N-diethylamino-1-methyl-3-phenyl-1H-pyrazolo[3,4-b]quinoline} (PAQ-NEt[sub 2]) doped into the hole-transporting layer of NPB {4,4[sup ′]-bis[N-(1-naphthyl-1-)-N-phenyl-amino]-biphenyl}, with the TPBI {2,2[sup ′],2[sup ″]-(1,3,5-phenylene)tris[1-phenyl-1H-benzimidazole]} as an electrontransporting material. At 16% PAQ-NEt[sub 2] doping concentration, the device gave a sharp, bright, and efficient green electroluminescence (EL) peaked at around 530 nm. The full width at half maximum of the EL is 60 nm, which is 60% of the green emission from typical NPB/AlQ [where AlQ=tris(8-hydroxyquinoline) aluminum] device. For the same concentration, a maximum luminance of 37 000 cd/m[sup 2] was obtained at 10.0 V and the maximum power, luminescence, and external quantum efficiencies were obtained 4.2 lm/W, 6.0 cd/A, and 1.6%, respectively, at 5.0 V. © 2000 American Institute of Physics.
ACCESSION #
4413737

 

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