Journal
APPLIED PHYSICS LETTERS
Volume 78, Issue 25, Pages 3947-3949Publisher
AMER INST PHYSICS
DOI: 10.1063/1.1379788
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We demonstrate efficient organic white light-emitting devices (LEDs), using N,N'-diphenyl-N,N'-bis(1-naphthyl)-(1,1'-biphenyl)-4,4'-diamine (NPB) as the hole-transporting layer, 1,6-bis(2-hydroxyphenyl)pyridine boron complex [(dppy)BF)] as the emitting layer, tris-(8-hydroxyquinoline)aluminum (Alq) as the electron-transporting and chromaticity-tuning layer. The white light comes from exciplex emission at the solid-state interface between (dppy)BF and NPB in addition to the exciton emission from NPB and (dppy)BF, respectively. The chromaticity of white emission can be tuned by adjusting the thickness of the Alq layer. The white LEDs with an Alq thickness of 15 nm, exhibit a maximum luminescence of 2000 cd/m(2) and efficiency of 0.58 ln/W, and the Commission Internationale De l'Eclairage coordinates of resulting emission vary from (0.29,0.33) to (0.31,0.35) with increasing forward bias from 10 to 25 V. The region is very close to the equienergy white point (0.33,0.33). (C) 2001 American Institute of Physics. Physics.
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