Highly efficient orange and warm white phosphorescent OLEDs based on a host material with a carbazole-fluorenyl hybrid

Research output: Journal Publications and Reviews (RGC: 21, 22, 62)21_Publication in refereed journalpeer-review

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Author(s)

  • Xiaoyang Du
  • Yun Huang
  • Silu Tao
  • Xiaoxia Yang
  • Chuan Wu
  • Huaixin Wei
  • Mei-Yee Chan
  • Vivian Wing-Wah Yam

Detail(s)

Original languageEnglish
Pages (from-to)1500-1505
Journal / PublicationChemistry - An Asian Journal
Volume9
Issue number6
Publication statusPublished - Jun 2014

Abstract

A new carbazole-fluorenyl hybrid compound, 3,3′(2,7-di(naphthaline-2- yl)-9H-fluorene-9,9-diyl)bis(9-phenyl-9H-carbazole) (NFBC) was synthesized and characterized. The compound exhibits blue-violet emission both in solution and in film, with peaks centered at 404 and 420 nm. In addition to the application as a blue emitter, NFBC is demonstrated to be a good host for phosphorescent dopants. By doping Ir(2-phq)3 in NFBC, a highly efficient orange organic light-emitting diode (OLED) with a maximum efficiency of 32 cd A -1 (26.5 Lm W-1) was obtained. Unlike most phosphorescent OLEDs, the device prepared in our study shows little efficiency roll-off at high brightness and maintains current efficiencies of 31.9 and 26.8 cd A -1 at a luminance of 1000 and 10 000 cd m-2, respectively. By using NFBC simultaneously as a blue fluorescence emitter and as a host for a phosphorescent dopant, a warm white OLED with a maximum efficiency of 22.9 Lm W-1 (21.9 cd A-1) was also obtained. Orange phosphorescence: A new carbazole-fluorenyl hybrid compound, 3,3′(2,7- di(naphthaline-2-yl)-9H-fluorene-9,9-diyl)bis(9-phenyl-9H-carbazole)(NFBC), was synthesized and characterized. By doping Ir(2-phq)3 in NFBC, a highly efficient orange organic light-emitting diode (OLED) with a maximum efficiency of 32 cd A-1 (26.5 lm W-1) was obtained. It is noteworthy that the device shows little efficiency roll-off at high brightness and maintains current efficiencies of 31.9 and 26.8 cd A-1 at a luminance of 1000 and 10 000 cd m-2, respectively. © 2014 WILEY-VCH Verlag GmbH & Co. KGaA, Weinheim.

Research Area(s)

  • blue fluorescent host, doping, fluorescence, OLEDs, phosphorescence, warm white emission

Citation Format(s)

Highly efficient orange and warm white phosphorescent OLEDs based on a host material with a carbazole-fluorenyl hybrid. / Du, Xiaoyang; Huang, Yun; Tao, Silu; Yang, Xiaoxia; Wu, Chuan; Wei, Huaixin; Chan, Mei-Yee; Yam, Vivian Wing-Wah; Lee, Chun-Sing.

In: Chemistry - An Asian Journal, Vol. 9, No. 6, 06.2014, p. 1500-1505.

Research output: Journal Publications and Reviews (RGC: 21, 22, 62)21_Publication in refereed journalpeer-review