Electroluminescence and Photoluminescence of Polyimide Films

LI Cai-xia; LIN Jia-qi; NI Hai-fang

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Electroluminescence and Photoluminescence of Polyimide Films

paper | 更新时间：2020-08-12

- Electroluminescence and Photoluminescence of Polyimide Films
- Chinese Journal of Luminescence Vol. 32, Issue 3, Pages: 232-236(2011)
- 作者机构：
  
  哈尔滨理工大学应用科学院, 黑龙江哈尔滨 150080
- 作者简介：
- 基金信息：
- DOI：
  CLC： O482.31
- Received：25 January 2010，
  
  Revised：24 June 2010，
  
  Published Online：22 March 2011，
  
  Published：22 March 2011
- 稿件说明：
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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
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 DOI：

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 DOI：

摘要

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。

Abstract

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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Keywords

references

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