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《Spectroscopy and Spectral Analysis》 2009-03
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The Role of BCP in Electroluminescence of Multilayer Organic Light-Emitting Devices

DENG Zhao-ru,YANG Sheng-yi,LOU Zhi-dong,MENG Ling-chuan Key Laboratory of Luminescence and Optical Information,Ministry of Education,Institute of Optoelectronic Technology,Beijing Jiaotong University,Beijing 100044,China  
As a hole-blocking layer,2,9-dimethyl-4,7-diphenyl-1,10-phenanthroline(BCP) is usually used in blue and white light electroluminescent devices.The ability of blocking holes of BCP layer depends on its thickness,and basically holes can tunnel through thin BCP layer.In order to know the role of BCP layer in electroluminescence(EL) of multilayer organic light-emitting diodes(OLEDs),in the present paper,the authors designed a multilayer OLED ITO/NPB/BCP/Alq3∶DCJTB/Alq3/Al and investigated the influence of thickness of BCP on the EL spectra of multilayer OLEDs at different applied voltages.The experimental data show that thin BCP layer can block holes partially and tune the energy transfer between different emissive layers,and in this way,it is easy to obtain white emission,but its EL spectra will change with the applied voltages.The EL spectra of multilayer device will remain relatively stable when BCP layer is thick enough,and the holes can hardly tunnel through when the thickness of BCP layer is more than 15 nm.Furthermore,the stability of EL spectra of the multilayer OLED at different applied voltages was discussed.
【Fund】: 国家自然科学基金项目(60406006 10434030);; 教育部新世纪优秀人才支持计划(NCET-06-0077);; 北京市自然科学基金项目(2062019);; 北京市科技新星计划项目(2006B20)资助
【CateGory Index】: TN383.1
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1 HOU Qing-chuan,WU Xiao-ming,HUA Yu-lin,QI Qing-jin,LI Lan,YIN Shou-gen School of Materials Science & Engineering,Tianjin University of Technology,Key Laboratory of Photoelectric Display Materials & Devices (Tianjin University of Technology),Ministry of Education,Tianjin Key Lab for Photoelectric Display Materials & Devices,Tianjin 300384,China;Effects of White Organic Light-Emitting Devices Using Color Conversion Films on Electroluminescence Spectra[J];Spectroscopy and Spectral Analysis;2010-06
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