期刊
ORGANIC ELECTRONICS
卷 14, 期 3, 页码 827-838出版社
ELSEVIER SCIENCE BV
DOI: 10.1016/j.orgel.2012.12.039
关键词
Forster energy transfer; Vacuum healing; White-light; OLED; Polyfluorene
资金
- Program for Changjiang Scholar and Innovation Research Team in University [IRT0972]
- International Science & Technology Cooperation Program of China [2012DFR50460]
- National Natural Scientific Foundation of China [21071108, 60976018, 21101111, 61274056, 61205179]
- Natural Science Foundation of Shanxi Province [2010021023-2, 2011021022-2]
- Key Scientific and Technological Project of Shanxi Province [20120321019]
- Japan Society for Promotion of Science [22560013]
- Grants-in-Aid for Scientific Research [22560013] Funding Source: KAKEN
Luminescence properties of a type of polyfluorene copolymer (PFO-DBT5) used for white-light organic light emitting device (OLED) were studied and discussed, in which a very low concentration of 0.05 mol% 4,7-bithienyl-2,1,3-benzothiadiazole (DBT) molecules were inserted in polyfluorene chain as orange-light unit. From the spectroscopic analysis of PFO-DBT5 in solution and nanoparticles, it is concluded that inter-chain Forster energy transfer from polyfluorene segments to DBT units play major role in process of white-light emission of PFO-DBT5. By measurement of electroluminescent properties, it is found that annealing of PFO-DBT5 film in vacuum is favorable for improving white-light emission owing to enhancement in inter-chain Forster energy transfer. CIE coordinates (0.38, 0.33) were obtained under the annealing temperature of 140 degrees C. It was found that the annealing temperature affects the luminance and efficiency of white-light OLED. The optimum annealing temperature was 100 degrees C. (c) 2013 Elsevier B.V. All rights reserved.
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