IEICE Electronics Express
Online ISSN : 1349-2543
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Bright and ultimately pure red electrophosphorescent diode bearing diphenylquinoxaline
Hiroyuki FujiiHidehiro SakuraiKazuyasu TaniKenichiro WakisakaToshikazu Hirao
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2005 Volume 2 Issue 8 Pages 260-266

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Abstract

The ultimately pure red OLED using new electrophosphorescent compound, bis(2,3-diphenylquinoxaline)iridium(acetylace-tonate) [(QH)2 Ir(acac)] is described. Electrophosphorescence peak wavelength and bandwidth were advanced for the purest red color stimulus to 680nm with full width at half maximum of 89nm by doping (QH)2 Ir(acac) into a light emitting electron transport layer composed of 3-(4-biphenylyl)-4-phenyl-5-(4-tert-butylphenyl)-1,2,4-triazole. The most vivid red electrophosphorescence with CIE chromaticity coordinates better than x=0.70 and y=0.28, which are the closest to the ultimate limit of pure red among reported OLEDs, was attained and maintained even in luminance brighter than 600cd/m2. A very high maximum external electrophosphorescent quantum efficiency of 10.2% was also realized.

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© 2005 by The Institute of Electronics, Information and Communication Engineers
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