TY - JOUR
T1 - Emission spectra dependence on voltage and emissive layer layout in organic light-emitting diodes
AU - Lü, Zhaoyue
AU - Hou, Ying
AU - Xiao, Jing
AU - Xu, Haisheng
N1 - Funding Information:
We thank the Fundamental Research Funds for the Central Universities ( 222201314022 & 222201314010 ), China Postdoctoral Science Foundation ( 2013M541480 ), Science and Technology Commission of Suzhou Municipality ( ZXG2012037 ), the National Natural Science Foundation of China ( 61204051 & 51303053 ) and the Science & Technology Development Project of Tai'an ( 20122053 ) for financially supporting this work.
PY - 2014/11
Y1 - 2014/11
N2 - Based on the device structure of indium tin oxide (ITO)/N,N′- diphenyl-N,N′-bis(1-naphthyl-phenyl)-1,1′-biphenyl-4, 4′-diamine (NPB)/4-(dicyanomethylene)-2-tert-butyl-6-(1,1,7,7- tetramethyljulolidyl-9-enyl)-4H-pyran (DCJTB)/tris (8-hydroxy quinoline) aluminum (Alq3)/NPB/bathocuproine (BCP)/Al, the variation of emissive spectra with voltage and emissive unit (DCJTB/Alq3/NPB) parameters has been investigated. All electroluminescent spectra contain two components: blue emission from NPB and red emission of DCJTB. The Alq3 emission is not observed due to its relative shallow LUMO (the lowest unoccupied molecular orbital) and deep HOMO (the highest occupied molecular orbital). The emission of NPB is increased with voltages as well as the thickness of NPB and Alq3 for more holes escape from DCJTB and get in NPB to recombine with electrons.
AB - Based on the device structure of indium tin oxide (ITO)/N,N′- diphenyl-N,N′-bis(1-naphthyl-phenyl)-1,1′-biphenyl-4, 4′-diamine (NPB)/4-(dicyanomethylene)-2-tert-butyl-6-(1,1,7,7- tetramethyljulolidyl-9-enyl)-4H-pyran (DCJTB)/tris (8-hydroxy quinoline) aluminum (Alq3)/NPB/bathocuproine (BCP)/Al, the variation of emissive spectra with voltage and emissive unit (DCJTB/Alq3/NPB) parameters has been investigated. All electroluminescent spectra contain two components: blue emission from NPB and red emission of DCJTB. The Alq3 emission is not observed due to its relative shallow LUMO (the lowest unoccupied molecular orbital) and deep HOMO (the highest occupied molecular orbital). The emission of NPB is increased with voltages as well as the thickness of NPB and Alq3 for more holes escape from DCJTB and get in NPB to recombine with electrons.
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U2 - 10.1016/j.vacuum.2014.07.026
DO - 10.1016/j.vacuum.2014.07.026
M3 - Article
AN - SCOPUS:84907362345
SN - 0042-207X
VL - 109
SP - 197
EP - 199
JO - Vacuum
JF - Vacuum
ER -