Effect of thermal stability on performance of β-phase poly(9,9-di-n-octylfluorene) in deep blue electroluminescence

被引：21
作者：
Jen, Tzu-Hao [1 ,2 ]
Wang, Kuo-Kai [1 ,2 ]
Chen, Show-An [1 ,2 ]
机构：
[1] Natl Tsing Hua Univ, Dept Chem Engn, Hsinchu 30013, Taiwan
[2] Natl Tsing Hua Univ, Frontier Res Ctr Fundamental & Appl Sci Matters, Hsinchu 30013, Taiwan
来源：
POLYMER | 2012年 / 53卷 / 25期
关键词：
beta phase; Poly(9,9-di-n-octylfluorene); Thermal stability; LIGHT-EMITTING-DIODES; POLYFLUORENE; EMISSION; FILMS; POLY(9,9-DI-N-OCTYL-2,7-FLUORENE); EFFICIENCY; CHAIN; PFO;
D O I：
10.1016/j.polymer.2012.10.014
中图分类号：
O63 [高分子化学（高聚物）];
学科分类号：
070305 ; 080501 ; 081704 ;
摘要：
The device performances including the emission spectrum and device efficiency of blue-emitting beta-phase poly(9,9-di-n-octylfluorene) (beta-PFO) annealed at different temperatures from 40 to 160 degrees C are investigated. The relatively unchanged beta-PFO content along with dominating photoluminescence (PL) and electroluminescence (EL) spectra are observed at the thermal annealing temperature (T-TA) below 90 degrees C. As T-TA > 90 degrees C, a gradual decrease in the beta-PFO fraction is observed, and there is a significant blue shift of emission spectra at T-TA > 130 degrees C which is due to a generation of large amount of crystalline PFO acting as an energy harvester. As for the device performance, beta-PFO can give relatively stable current efficiency and brightness at a temperature between 50 and 80 degrees C. Based on these results, it suggests that blue-emitting beta-PFO is practically applicable in display and illumination as a stable deep-blue light source. (C) 2012 Elsevier Ltd. All rights reserved.
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收藏
页码：5850 / 5855
页数：6
相关论文
共 23 条
[1]   Chain morphologies in semicrystalline polyfluorene: Evidence from raman scattering [J].
Arif, M ;
Volz, C ;
Guha, S .
PHYSICAL REVIEW LETTERS, 2006, 96 (02)
[2]   Influence of film morphology on the vibrational spectra of dioctyl substituted polyfluorene (PFO) [J].
Ariu, M ;
Lidzey, DG ;
Bradley, DDC .
SYNTHETIC METALS, 2000, 111 :607-610
[3]   Control of effective conjugation length in polyfluorene thin films [J].
Asada, K ;
Kobayasi, T ;
Naito, H .
JAPANESE JOURNAL OF APPLIED PHYSICS PART 2-LETTERS & EXPRESS LETTERS, 2006, 45 (8-11) :L247-L249
[4]   Dual species emission from single polyfluorene molecules: Signatures of stress-induced planarization of single polymer chains [J].
Becker, K ;
Lupton, JM .
JOURNAL OF THE AMERICAN CHEMICAL SOCIETY, 2005, 127 (20) :7306-7307
[5]   Noncrystalline phases in poly(9,9-di-n-octyl-2,7-fluorene) [J].
Chen, SH ;
Su, AC ;
Chen, SA .
JOURNAL OF PHYSICAL CHEMISTRY B, 2005, 109 (20) :10067-10072
[6]   Crystalline forms and emission behavior of poly(9,9-di-n-octyl-2,7-fluorene) [J].
Chen, SH ;
Su, AC ;
Su, CH ;
Chen, SA .
MACROMOLECULES, 2005, 38 (02) :379-385
[7]   A Multitechnique Study of Structure and Dynamics of Polyfluorene Cast Films and the Influence on Their Photoluminescence [J].
Faria, G. C. ;
Plivelic, T. S. ;
Cossiello, R. F. ;
Souza, A. A. ;
Atvars, T. D. Z. ;
Torriani, I. L. ;
deAzevedo, E. R. .
JOURNAL OF PHYSICAL CHEMISTRY B, 2009, 113 (33) :11403-11413
[8]   Interplay of physical structure and photophysics for a liquid crystalline polyfluorene [J].
Grell, M ;
Bradley, DDC ;
Ungar, G ;
Hill, J ;
Whitehead, KS .
MACROMOLECULES, 1999, 32 (18) :5810-5817
[9]   Morphology dependence of the triplet excited state formation and absorption in polyfluorene -: art. no. 241302 [J].
Hayer, A ;
Khan, ALT ;
Friend, RH ;
Köhler, A .
PHYSICAL REVIEW B, 2005, 71 (24)
[10]   Design of hole blocking layer with electron transport channels for high performance polymer light-emitting diode [J].
Hsiao, Chung-Chin ;
Hsiao, An-En ;
Chen, Show-An .
ADVANCED MATERIALS, 2008, 20 (10) :1982-+
123