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Proceedings Paper

Red fluorenes as the efficient host emitter for nondoped red organic light-emitting diodes
Author(s): Chih-Long Chiang; Min-Fei Wu; Ching-Fong Shu; Chin-Ti Chen
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Paper Abstract

Crystallinic red fluorophores based on donor-acceptor substituted spirofluorene, i.e., PhSPDCV show strong fluorescence in solution (Φf ~ 70 %) as well as in solid state (Φf > 30 %). Non-doped red OLEDs fabricated with PhSPDCV exhibit authentic red (CIE, x = 0.65, y = 0.35) electroluminescence with brightness over 12,000 cd m-2 (or > 600 cd m-2 at 20 mA cm-2) and remarkable external quantum efficiency as high as 3.6%. On the other hand, the bis-substituted derivatives of spirofluorene BisPhSPDCV show relatively weak fluorescence both in solution (&PHgr;f < 20 %) and in solid state (Φf < 10%). Although saturated red electroluminescence (CIE, x = 0.65, y = 0.34) is also observed, non-doped red OLED containing BisPhSPDCV performs much worse than PhSPDCV OLEDs. Both PhSPDCV and BisPhSPDCV are not amorphous forming loosely packed crystallinic materials in solid state with no intimate π-π interaction.

Paper Details

Date Published: 12 January 2005
PDF: 8 pages
Proc. SPIE 5632, Light-Emitting Diode Materials and Devices, (12 January 2005); doi: 10.1117/12.569483
Show Author Affiliations
Chih-Long Chiang, National Chiao Tung Univ. (Taiwan)
Academia Sinica (Taiwan)
Min-Fei Wu, Academia Sinica (Taiwan)
Ching-Fong Shu, National Chiao Tung Univ. (Taiwan)
Chin-Ti Chen, Academia Sinica (Taiwan)

Published in SPIE Proceedings Vol. 5632:
Light-Emitting Diode Materials and Devices
Gang Yu; Chuangtian Chen; Changhee Lee, Editor(s)

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