Mr. Jian Li Profile

Jian Li

at Univ of Southern California

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Proceedings Article | 20 October 2004 Paper

Triple-doped white organic light-emitting devices grown in vacuum

Brian D'Andrade, Russell Holmes, Stephen Forrest, Jian Li, Mark Thompson

Proceedings Volume 5530, (2004) https://doi.org/10.1117/12.582840

KEYWORDS: Organic light emitting diodes, Excitons, Quantum efficiency, Energy transfer, Light sources and illumination, Iridium, Solid state lighting, Light sources, Electrons, Molecules

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We demonstrate efficient (η_p=11±1 lm/W at 1000 cd/m²), bright electrophosphorescent white organic light emitting devices (WOLEDs) employing three dopants in a 9-nm-thick inert host matrix. The emissive layer consists of 2 wt.% iridium (III) bis(2-phenyl quinolyl-N,C^2') acetylacetonate (PQIr), 0.5 wt.% fac-tris(2-phenylpyridine) iridium (Ir(ppy)₃) and 20 wt.% bis(4’,6’-difluorophenylpyridinato)tetrakis(1-pyrazolyl)borate (FIr6) co-doped into a wide energy gap p-bis(triphenylsilyly)benzene (UGH2) host. Devices were characterized in terms relevant to both display and general lighting applications, and have a peak total power efficiency of 42±4 lm/W at low intensities, falling to 10±1 lm/W at a drive current of 20 mA/cm² (corresponding to 1.4 lm/cm² for an isotropic illumination source). The Commission Internationale de l’Eclairage coordinates shift from (0.43,45) at 0.1 mA/cm² to (0.38,0.45) at 10 mA/cm², and a color rendering index >75 is obtained. Three factors contribute to the high efficiency: thin layers leading to low voltage operation, a high quantum efficiency blue dopant, and efficient confinement of charge and excitons within the emissive region. The highest occupied and lowest unoccupied energy levels of component layers will be discussed to elucidate charge and exciton confinement within the emissive layer. Additionally, we will explain energy transfer between dopants based on photoluminescent transient analysis of triple-doped thin films.

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