20 April 2006 Novel triplet host materials with high energy gap and thermal stability for organic electrophosphorescent devices
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Abstract
Organic electrophosphorescent materials and devices are the prime focus of organic light-emitting diodes research due to their high external quantum efficiency and power efficiency. The host materials with both high triplet energy level and high thermal stability are especially formidable for blue phosphorescent emitters. Herewith we report a novel triplet host material based on fluorene, 9,9-bis(4'-carbazol-phenyl)fluorene (CPF), in which two phenyl-carbazole moieties are connected to C9 carbon of the fluorene. This compound possesses not only desirably high triplet (2.9 eV) energies, but also extremely high glass transition temperature (Tg = 165 °C) and thermal stability. By using CPF as the host material, blue-emitting phosphorescent devices exhibited much higher efficiency and longer lifetime than those with CBP host.
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Juan Qiao, Li D Wang, Yong Qiu, "Novel triplet host materials with high energy gap and thermal stability for organic electrophosphorescent devices", Proc. SPIE 6192, Organic Optoelectronics and Photonics II, 61920T (20 April 2006); doi: 10.1117/12.666915; https://doi.org/10.1117/12.666915
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