The effect of the host structure on the optimum doping concentration in red phosphorescent organic light-emitting diodes (PHOLEDs) was investigated. A mixed host of the phosphine oxide derivative (SPPO21) and 4.4',4 ''-tris(N-carbazolyl)triphenylamine (TCTA) was used as the host in the red PHOLED and the device performances were studied according to the doping concentration. The device performance of the red PHOLED was optimized at a doping concentration of 2% in the SPPO21 rich red PHOLED, while the device performance was optimized at a doping concentration of 6% in the device with 50% TCTA content. It was found that the optimum doping concentration was determined by the energy transfer and charge trapping. (c) 2011 Elsevier B.V. All rights reserved.
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S China Univ Technol, Inst Polymer Optoelect Mat & Devices, State Key Lab Luminescent Mat & Devices, Guangzhou, Guangdong, Peoples R ChinaS China Univ Technol, Inst Polymer Optoelect Mat & Devices, State Key Lab Luminescent Mat & Devices, Guangzhou, Guangdong, Peoples R China
Zhang, Jie
Zhang, Kai
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S China Univ Technol, Inst Polymer Optoelect Mat & Devices, State Key Lab Luminescent Mat & Devices, Guangzhou, Guangdong, Peoples R ChinaS China Univ Technol, Inst Polymer Optoelect Mat & Devices, State Key Lab Luminescent Mat & Devices, Guangzhou, Guangdong, Peoples R China
Zhang, Kai
Liu, Shengjian
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S China Univ Technol, Inst Polymer Optoelect Mat & Devices, State Key Lab Luminescent Mat & Devices, Guangzhou, Guangdong, Peoples R ChinaS China Univ Technol, Inst Polymer Optoelect Mat & Devices, State Key Lab Luminescent Mat & Devices, Guangzhou, Guangdong, Peoples R China
Liu, Shengjian
Liang, Aihui
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S China Univ Technol, Inst Polymer Optoelect Mat & Devices, State Key Lab Luminescent Mat & Devices, Guangzhou, Guangdong, Peoples R ChinaS China Univ Technol, Inst Polymer Optoelect Mat & Devices, State Key Lab Luminescent Mat & Devices, Guangzhou, Guangdong, Peoples R China
Liang, Aihui
Huang, Xuelong
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S China Univ Technol, Inst Polymer Optoelect Mat & Devices, State Key Lab Luminescent Mat & Devices, Guangzhou, Guangdong, Peoples R ChinaS China Univ Technol, Inst Polymer Optoelect Mat & Devices, State Key Lab Luminescent Mat & Devices, Guangzhou, Guangdong, Peoples R China
Huang, Xuelong
Huang, Fei
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S China Univ Technol, Inst Polymer Optoelect Mat & Devices, State Key Lab Luminescent Mat & Devices, Guangzhou, Guangdong, Peoples R ChinaS China Univ Technol, Inst Polymer Optoelect Mat & Devices, State Key Lab Luminescent Mat & Devices, Guangzhou, Guangdong, Peoples R China
Huang, Fei
Peng, Junbiao
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S China Univ Technol, Inst Polymer Optoelect Mat & Devices, State Key Lab Luminescent Mat & Devices, Guangzhou, Guangdong, Peoples R ChinaS China Univ Technol, Inst Polymer Optoelect Mat & Devices, State Key Lab Luminescent Mat & Devices, Guangzhou, Guangdong, Peoples R China
Peng, Junbiao
Cao, Yong
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S China Univ Technol, Inst Polymer Optoelect Mat & Devices, State Key Lab Luminescent Mat & Devices, Guangzhou, Guangdong, Peoples R ChinaS China Univ Technol, Inst Polymer Optoelect Mat & Devices, State Key Lab Luminescent Mat & Devices, Guangzhou, Guangdong, Peoples R China
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Seoul Natl Univ, Dept Mat Sci & Engn, Seoul 151744, South KoreaSeoul Natl Univ, Dept Mat Sci & Engn, Seoul 151744, South Korea
Lim, Hyoungcheol
Shin, Hyun
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Seoul Natl Univ, Dept Mat Sci & Engn, Seoul 151744, South KoreaSeoul Natl Univ, Dept Mat Sci & Engn, Seoul 151744, South Korea
Shin, Hyun
Kim, Kwon-Hyeon
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Seoul Natl Univ, Dept Mat Sci & Engn, Seoul 151744, South KoreaSeoul Natl Univ, Dept Mat Sci & Engn, Seoul 151744, South Korea
Kim, Kwon-Hyeon
Yoop, Seung-Jun
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Seoul Natl Univ, Dept Mat Sci & Engn, Seoul 151744, South Korea
LG Chem LTD, Daejun 34122, South KoreaSeoul Natl Univ, Dept Mat Sci & Engn, Seoul 151744, South Korea
Yoop, Seung-Jun
Huh, Jin-Suk
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Seoul Natl Univ, Dept Mat Sci & Engn, Seoul 151744, South KoreaSeoul Natl Univ, Dept Mat Sci & Engn, Seoul 151744, South Korea
Huh, Jin-Suk
Kim, Jang-Joo
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Seoul Natl Univ, Dept Mat Sci & Engn, Seoul 151744, South Korea
Seoul Natl Univ, Res Inst Adv Mat, Seoul 151744, South KoreaSeoul Natl Univ, Dept Mat Sci & Engn, Seoul 151744, South Korea