Luminescent Properties of A Novel Terbium Complex Tb(o-BBA)3(phen)
来源期刊：JOURNAL OF RARE EARTHS2006年第2期
论文作者：Liu Ling Pei Juan Zhang Fujun Sun Bo Xu Zheng Lou Zhidong
Key words：Tb complex; energy transfer; charge trapping; electroluminescence; rare earths;
Abstract: A novel rare earth complex of terbium ion with 2-benzoylbenzoic acid and 1,10-phenathroline (Tb(o-BBA)3(phen), o-BBA=2-benzoylbenzoic acid, phen=1,10-phenathroline) was used as an electroluminescent material for the first time.The Tb complex was blended with poly(N-vinylcarbazole) (PVK) in different weight ratios and spinn to coated into films (noted as PVK:Tb films).The photoluminescence (PL) properties of films were investigated and the optimum weight ratio between PVK and Tb(o-BBA)3(phen) was found to be 3:1.Monolayer devices with the structure ITO/PVK:Tb/Al were fabricated and emitted green light, which was characteristic of Tb3+ emission.The results show that mechanisms for PL and EL are different.The PL is considered to be caused because of energy transfer and direct excitation to the Tb(o-BBA)3(phen) molecule, while EL is mainly on charging trapping.
Liu Ling1，Pei Juan3，Zhang Fujun1，Sun Bo3，Xu Zheng1，Lou Zhidong1
(1.Institute of Optoelectronics Technology, Beijing Jiaotong University, Beijing 100044,China;
2.Key Laboratory of Luminescence and Optical Information, Ministry of Education;
3.Department of Materials Chemistry, College of Chemistry, Nankai University, Tianjin 300071, China)
Abstract:A novel rare earth complex of terbium ion with 2-benzoylbenzoic acid and 1,10-phenathroline (Tb(o-BBA)3(phen), o-BBA=2-benzoylbenzoic acid, phen=1,10-phenathroline) was used as an electroluminescent material for the first time.The Tb complex was blended with poly(N-vinylcarbazole) (PVK) in different weight ratios and spinn to coated into films (noted as PVK:Tb films).The photoluminescence (PL) properties of films were investigated and the optimum weight ratio between PVK and Tb(o-BBA)3(phen) was found to be 3:1.Monolayer devices with the structure ITO/PVK:Tb/Al were fabricated and emitted green light, which was characteristic of Tb3+ emission.The results show that mechanisms for PL and EL are different.The PL is considered to be caused because of energy transfer and direct excitation to the Tb(o-BBA)3(phen) molecule, while EL is mainly on charging trapping.
Key words:Tb complex; energy transfer; charge trapping; electroluminescence; rare earths;
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