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哈尔滨理工大学 应用科学院, 黑龙江 哈尔滨 150080
收稿日期:2010-01-25,
修回日期:2010-06-24,
网络出版日期:2011-03-22,
纸质出版日期:2011-03-22
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李彩霞, 林家齐, 倪海芳. 聚酰亚胺薄膜的电致发光和光致发光[J]. 发光学报, 2011,32(3): 232-236
LI Cai-xia, LIN Jia-qi, NI Hai-fang. Electroluminescence and Photoluminescence of Polyimide Films[J]. Chinese Journal of Luminescence, 2011,32(3): 232-236
测量了氙灯辐照后聚酰亚胺(PI)薄膜的光致发光(PL)强度、PL谱和氙灯辐照后直流高电场下PI薄膜的电致发光(EL)强度、EL谱、XRD谱和吸收光谱
研究了其EL、PL特性与微观结构的关系。结果表明: PI薄膜的PL强度随测量时间呈指数衰减
EL强度随场强呈指数增长;辐照39 h后
PI的预击穿场强为2.56 MV/cm
低于原始PI的2.8 MV/cm;EL和PL光谱均在320
395
443
585
656
752 nm附近出现发光峰;辐照时间增长
PL强度明显增大
衰减变慢
PL峰数减少且红移
吸收边的最大吸收波长红移;场强增加
EL峰数减少且发生蓝移;由吸收边算得PI的光能隙约为2.76 eV
比由PL光谱算得的结果小0.38 eV。这些结果由光老化和电老化的综合作用所致。
Photoluminescence (PL) of polyimide (PI) thin films irradiated by xenon lamp
electroluminescence (EL) of PI thin films irradiated by xenon lamp under high DC high electric fields and their XRD patterns
absorption spectra were measured. The PL intensity shows an exponential decay with the measuring time. The EL intensity shows exponential increase with electric field. After irradiated 39 h
the pre-breakdown electric field of PI is about 2.56 MV/cm
lower than 2.8 MV/cm before irradiation. Both spectra EL and PL spectra consist peaks near 320
395
443
585
656
752 nm. As the irradiation time becomes longer
PL intensity increases obviously and decays more lowly. PL spectra peaks shift to longer wavelength. And the maximum of absorption wavelength appears red shift. As the applied electric field becomes higher
the EL spectra have fewer peaks and EL peaks appears blue shift. The energy gap of PI was calculated according to the spectral absorption
the value is about 2.76 eV
lower than the value (3.14 eV)
calculated according to the PL spectra. These results are likely due to integrated effect of photo-aging and electric aging.
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