https://scholars.lib.ntu.edu.tw/handle/123456789/155566
標題: | All non-dopant red-green-blue composing white organic light-emitting diodes | 作者: | Yeh, Shi-Jay Chen, Hung-Yang Wu, Min-Fei Chan, Li-Hsin Chiang, Chih-Long Yeh, Hsiu-Chih Chen, Chin-Ti JIUN-HAW LEE |
關鍵字: | Blue; Non-dopant; Organic light-emitting diode; Red; White | 公開日期: | 2006 | 卷: | 7 | 期: | 3 | 起(迄)頁: | 137 - 143 | 來源出版物: | Organic Electronics | 摘要: | All non-dopant white organic light-emitting diodes (WOLEDs) have been realized by using solid state highly fluorescent red bis(4-(N-(1-naphthyl)phenylamino)phenyl)fumaronitrile (NPAFN) and amorphous bipolar blue light-emitting 2-(4-diphenylamino)phenyl-5-(4-triphenylsilyl)phenyl-1,3,4-oxadiazole (TPAOXD), together with well known green fluorophore tris(8-hydroxyquinolinato)aluminum (Alq3). The fabrication of multilayer WOLEDs did not involve the hard-to-control doping process. Two WOLEDs, Device B and C, different in layer thickness of Alq3, 30 and 15 nm, respectively, emitted strong electroluminescence (EL) as intense as 25,000 cd/m2. For practical solid state lighting application, EL intensity exceeding 1000 cd/m2 was achieved at current density of 18-19 mA/cm2 or driving voltage of 6.5-8 V and the devices exhibited external quantum efficiency (ηext) of 2.6-2.9% corresponding to power efficiency (ηP) of 2.1-2.3 lm/W at the required brightness. The thickness of Alq3 layer is decisive in color quality of non-dopant WOLEDs. The Commission Internationale de l'Eclairage (CIE) coordinates of fairly white EL of Device B varied only little from (0.34, 0.39) to (0.34, 0.38) at driving voltage between 6 and 14 V. Device B exhibited relatively high color rendering indexes (CRIs) in the range of 74-81, which were essentially voltage-independent. The other WOLED, Device C, showed even better color purity of white EL (CIEx,y = 0.34, 0.31) along with higher CRI of 83 at 8 V, although higher voltage deteriorated the color quality of WOLED. © 2005 Elsevier B.V. All rights reserved. |
URI: | https://www.scopus.com/inward/record.uri?eid=2-s2.0-33646101691&doi=10.1016%2fj.orgel.2005.12.004&partnerID=40&md5=bc28e972fa78aa3bff5315d657866ddd | ISSN: | 15661199 | DOI: | 10.1016/j.orgel.2005.12.004 | SDG/關鍵字: | Electroluminescence; Fluorescence; Multilayers; Nitrogen compounds; Quantum efficiency; Solid state devices; Blue; Non-dopant; Organic light-emitting diode; Red; White; Light emitting diodes |
顯示於: | 電機工程學系 |
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