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Chin. Phys. B, 2011, Vol. 20(3): 037804    DOI: 10.1088/1674-1056/20/3/037804
CONDENSED MATTER: ELECTRONIC STRUCTURE, ELECTRICAL, MAGNETIC, AND OPTICAL PROPERTIES Prev   Next  

Influence of Si4+ substitution on the temperature-dependent characteristics of Y3Al5O12:Ce

Xu Sheng-Yan(徐生艳), Zhang Xiao-Song(张晓松), Zhou Yong-Liang(周永亮), Xi Qun(奚群), and Li Lan(李岚)
Insititute of Material Physics, Tianjin University of Technology, Key Laboratory of Display Materials and Photoelectric Devices, Ministry of Education, The Tianjin Key Laboratory for Optoelectronic Materials and Devices, Tianjin 300384, China
Abstract  A series of Y3Al5O12:Ce (YAG:Ce) phosphors doped with different Si4+ concentrations is prepared by solid-state reaction. The temperature dependent characteristics of luminescent spectrum and decay time of Ce3+ are investigated. With Si4+ doped, the emission spectrum shows a blue shift due to a decrease of the splitting of 5d levels of Ce3+ ion. The thermal stability is greatly improved by adding Si4+ because the activation energy ΔE increases from 0.1836 eV to 0.2401 eV. The study of the decay times against temperature for various doping concentrations of Si4+ shows that the calculated nonradiative decay rate is affected by Si4+ substitution. The results are explained by the configurational coordinate diagram.
Keywords:  phosphor      luminescence      temperature dependence      decay time  
Received:  22 June 2010      Revised:  22 July 2010      Accepted manuscript online: 
PACS:  78.55.-m (Photoluminescence, properties and materials)  
  71.70.-d (Level splitting and interactions)  
  71.70.Ch (Crystal and ligand fields)  
Fund: Project supported by the National Basic Research Program of China (Grant No. 6139702), the National Natural Science Foundation of China (Grant Nos. 60877029, 60977035 and 60907021), the Natural Science Foundation of the Tianjin Education Committee, China(Grant No. 20071207), and the Natural Science Foundation of Tianjin, China (Grant Nos. 09JCYBJC01400 and 07JCYBJC06400).

Cite this article: 

Xu Sheng-Yan(徐生艳), Zhang Xiao-Song(张晓松), Zhou Yong-Liang(周永亮), Xi Qun(奚群), and Li Lan(李岚) Influence of Si4+ substitution on the temperature-dependent characteristics of Y3Al5O12:Ce 2011 Chin. Phys. B 20 037804

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