Red fluorenes as the efficient host emitter for nondoped red organic light-emitting diodes

Chih-Long Chiang; Min-Fei Wu; Ching-Fong Shu; Chin-Ti Chen

doi:10.1117/12.569483

12 January 2005 Red fluorenes as the efficient host emitter for nondoped red organic light-emitting diodes

Chih-Long Chiang, Min-Fei Wu, Ching-Fong Shu, Chin-Ti Chen

Proceedings Volume 5632, Light-Emitting Diode Materials and Devices; (2005) https://doi.org/10.1117/12.569483
Event: Photonics Asia, 2004, Beijing, China

Abstract

Crystallinic red fluorophores based on donor-acceptor substituted spirofluorene, i.e., PhSPDCV show strong fluorescence in solution (Φ_f ~ 70 %) as well as in solid state (Φ_f > 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 (Φ_f < 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.

Citation Download Citation

Chih-Long Chiang, Min-Fei Wu, Ching-Fong Shu, and Chin-Ti Chen "Red fluorenes as the efficient host emitter for nondoped red organic light-emitting diodes", Proc. SPIE 5632, Light-Emitting Diode Materials and Devices, (12 January 2005); https://doi.org/10.1117/12.569483

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KEYWORDS

Organic light emitting diodes

Crystals

Luminescence

Electroluminescence

Quantum efficiency

Molecules

Solid state physics

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