標題: High-efficiency organic electroluminescent device with multiple emitting units
作者: Chang, CC
Hwang, SW
Chen, CH
Chen, JF
電子物理學系
友訊交大聯合研發中心
Department of Electrophysics
D Link NCTU Joint Res Ctr
關鍵字: OLED;doping;high efficiency;electroluminescence;lifetime
公開日期: 1-Sep-2004
摘要: In this paper, we report on the fabrication of multilayer organic light emitting diodes (OLEDs) with high electroluminescent (EL) yield achieved by integrating two units of green-emissive devices in series. The architecture of the device used in the experiment is Indium-Tin-Oxid (ITO)/CuPc/NPB/C545T:Alq(3)/Alq(3)/Mg:Alq(3)/WO3/NPB/C545T:Alq(3)/Alq(3)/LiF/Al. We found the efficiency of the two-unit devices can be controllable by the thickness Of WO3. The two-unit devices with 1-nm-thick WO3 produces the luminance efficiency of 49.2 cd/A at 20 mA/cm(2), which is around four times that of the controlled single-unit device (ITO/CuPc/NPB/C545T:Alq(3)/Alq(3)/LiF/Al). Compared with reported research data, the "amplification effect" discovered in our device is a rather unexpected result. The external quantum efficiency of 12.6%, with near-saturated Commission Internationale d'Eclairage coordinates (CIEx = 0.27, CIEy = 0.68), is one of the best ever reported for a fluorescent dye-doped OLED. We also demonstrate that the electron injection layer of Mg:Alq(3) is a necessary component for the enhancement of EL efficiency. These results may prove to be an effective method to enhance the efficiency as well as the lifetime of current OLEDs.
URI: http://dx.doi.org/10.1143/JJAP.43.6418
http://hdl.handle.net/11536/26396
ISSN: 0021-4922
DOI: 10.1143/JJAP.43.6418
期刊: JAPANESE JOURNAL OF APPLIED PHYSICS PART 1-REGULAR PAPERS SHORT NOTES & REVIEW PAPERS
Volume: 43
Issue: 9A
起始頁: 6418
結束頁: 6422
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