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학술지 Understanding the Influence of Doping in Efficient Phosphorescent Organic Light-Emitting Diodes with an Organic p-i-n Homojunction
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저자
Changhun Yun, Guohua Xie, Caroline Murawski, 이종희, Fabian Ventsch, Karl Leo, Malte C. Gather
발행일
201307
출처
Organic Electronics, v.14 no.7, pp.1695-1703
ISSN
1566-1199
출판사
Elsevier
DOI
https://dx.doi.org/10.1016/j.orgel.2013.04.018
협약과제
12VB1300, 에너지 절감을 위한 7인치기준 2W급 환경적응 디스플레이 신모드 핵심 원천 기술 개발, 추혜용
초록
We report on the development and detailed investigation of highly efficient p-i-n phosphorescent organic light-emitting diodes (PhOLEDs) using 4,4??-bis(carbazol-9-yl)-biphenyl (CBP) as a single organic semiconductor matrix. Following optimization of doping concentration of both the phosphorescent emitter molecule and of the p- and n-type dopants, an external quantum efficiency (EQE) of 15% and a power efficiency (PE) of 28 lm/W are realized at a luminance of 1000 cd/m2. These values are comparable to the state-of-the-art for conventional complex multilayered PhOLEDs. By analyzing the device characteristics (i.e. electroluminescence spectra, the current density-voltage behavior of single carrier devices, the transient electroluminescent decay, and the impedance spectroscopy response), we find that the device performance is closely linked to the charge carrier balance in the device, which in turn is governed by the interplay of the conductivities of the doped layers and the transport of each charge carrier species within the emitting layer. © 2013 Elsevier B.V. All rights reserved.
키워드
Homojunction, Organic light emitting diodes, p-i-n Photodiodes, Phosphorescence
KSP 제안 키워드
Charge carrier balance, Current density-voltage, Device characteristics, Doped layers, Doping concentration, Electroluminescence spectra, External Quantum Efficiency, Impedance spectroscopy(IS), Influence of doping, Organic light-emitting diodes(OLEDS), Organic semiconductor