Open AccessMulticomponent excited-state emissions in a bilayer organic electroluminescent device
Author(s) -
Wenqing Zhu,
Yi-nan Wu,
Zheng Xin-You,
Xue-Yin Jiang,
Zhilin Zhang,
Rong Sun,
Sheng Xu
Publication year - 2004
Publication title -
wuli xuebao
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.199
H-Index - 47
ISSN - 1000-3290
DOI - 10.7498/aps.53.2325
Subject(s) - electroluminescence , materials science , excited state , bilayer , photoluminescence , excimer , optoelectronics , oled , population , biphenyl , photochemistry , fluorescence , atomic physics , nanotechnology , chemistry , optics , organic chemistry , membrane , physics , layer (electronics) , demography , sociology , biochemistry
Multicomponent excited-state emissions from monomer, exciplex and electroplex were observed in a bilayer organic electroluminescent device with a structure of ITO/TPD(60nm)/PBD(60nm)/Al(where TPD and PBD stand for N,N′diphenylN,N′bis(3-methylphenyl)1,1′biphenyl4,4′diamine) and (2(4′biphenyl)5(4″tertbutylphenyl)1,3,4oxadiazole, respectively). The difference between the photoluminescence of this device and the TPD∶PBD equimolar evaporated films suggests that the exciplex takes place only at the interface of TPD/PBD. The Variation of electroluminescence spectra with bias indicates the different formation mechanisms and the different population of each excited state component, as well as the different dynamic recombination process of carriers in this device.