64.3: High‐Efficiency Phosphorescent White OLEDs Using Red‐Emitting Osmium Complex and Blue‐Emitting Iridium Complex

Chang, Chih‐Hao; Lin, Chun Liang; Lin, You Heng; Su, Hai‐Ching; Wu, Chung Chih; Chen, Li Shiuan; Wu, Wen Wen; Chi, Yun

doi:10.1889/1.2785674

Cited by 2 publications

(1 citation statement)

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“…However, as can be seen from the electroluminescence (EL) spectra of the white device at different voltages in Fig. 6, the intensity of the red wavelength gradually decreases, which is caused by the decrease in energy transfer rate from FIrpic to Os when the driving current density increases, 17) leading to blue shift. From the results of the above experiments shown in Fig.…”

Section: Resultsmentioning

confidence: 95%

Power Efficiency Improvement of White Phosphorescent Organic Light-Emitting Diode with Thin Double-Emitting Layers and Hole-Trapping Mechanism

Juang

Wang

et al. 2011

Jpn. J. Appl. Phys.

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This study is carried out to discuss how to reduce the driving voltage of blue phosphorescent organic light-emitting diodes (PHOLEDs) by using a thin double-emission layer. A hole transport-type host (TCTA) is inserted between the hole transport layer (TAPC) and the emitting layer (EML), constituting a buffer layer between them with the aim of improving charge carrier balance. Furthermore, in this study, we also utilize the interface between double light-emitting layers of devices by codoping them with a red phosphorescent dopant [Os(bpftz) 2 (PPh 2 Me) 2 ]. An Os complex with a high-lying highest occupied molecular orbital (HOMO) energy level (trapping holes) is codoped at the interface between emitting layers and an exciton-formation zone is expanded to obtain a white PHOLED with high efficiency. From the results, the optimal structure of the white device exhibits a yield of 35 cd A À1 , a power efficiency of 22 lm W À1 , and CIE coordinates of ð0:33; 0:38Þ at a luminance of 1000 cd m À2. Furthermore, the power efficiency can be improved to 30 lm W À1 by attaching the outcoupling enhancement film.

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Section: Resultsmentioning

confidence: 95%