Charge deformation and orbital hybridization: intrinsic mechanisms on tunable chromaticity of Y3Al5O12:Ce3+ luminescence by doping Gd3+ for warm white LEDs

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	Charge deformation and orbital hybridization: intrinsic mechanisms on tunable chromaticity of Y3Al5O12:Ce3+ luminescence by doping Gd3+ for warm white LEDs
	Chen, L; Chen, XL; Liu, FY; Chen, HH; Wang, H; Zhao, EL; Jiang, Y; Chan, TS; Wang, CH; Zhang, WH
刊名	SCIENTIFIC REPORTS
	2015
卷号	5 页码:—
关键词	TEMPERATURE-GRADIENT TECHNIQUE ELECTRONIC-STRUCTURE GARNET PHOSPHORS SINGLE-CRYSTALS YAG CRYSTALS PHOTOLUMINESCENCE EMISSION LIGHT CE3+
ISSN号	2045-2322
通讯作者	Chen, L (reprint author), Hefei Univ Technol, Sch Mat Sci & Engn, Hefei 230009, Peoples R China.
英文摘要	The deficiency of Y3Al5O12:Ce (YAG:Ce) luminescence in red component can be compensated by doping Gd3+, thus lead to it being widely used for packaging warm white light-emitting diode devices. This article presents a systematic study on the photoluminescence properties, crystal structures and electronic band structures of (Y1-xGdx)(3)Al5O12:Ce3+ using powerful experimental techniques of thermally stimulated luminescence, X-ray diffraction, X-ray absorption near edge structure (XANES), extended X-ray absorption fine structure (EXAFS) and ultraviolet photoelectron spectra (UPS) of the valence band, assisted with theoretical calculations on the band structure, density of states (DOS), and charge deformation density (CDD). A new interpretation from the viewpoint of compression deformation of electron cloud in a rigid structure by combining orbital hybridization with solid-state energy band theory together is put forward to illustrate the intrinsic mechanisms that cause the emission spectral shift, thermal quenching, and luminescence intensity decrease of YAG:Ce upon substitution of Y3+ by Gd3+, which are out of the explanation of the classic configuration coordinate model. The results indicate that in a rigid structure, the charge deformation provides an efficient way to tune chromaticity, but the band gaps and crystal defects must be controlled by comprehensively accounting for luminescence thermal stability and efficiency.
收录类别	SCI
语种	英语
WOS记录号	WOS:000357921900001
公开日期	2016-03-08
内容类型	期刊论文
源URL	[http://ir.sinap.ac.cn/handle/331007/24884]
专题	上海应用物理研究所_中科院上海应用物理研究所2011-2017年
推荐引用方式 GB/T 7714	Chen, L,Chen, XL,Liu, FY,et al. Charge deformation and orbital hybridization: intrinsic mechanisms on tunable chromaticity of Y3Al5O12:Ce3+ luminescence by doping Gd3+ for warm white LEDs[J]. SCIENTIFIC REPORTS,2015,5:—.
APA	Chen, L.,Chen, XL.,Liu, FY.,Chen, HH.,Wang, H.,...&Chen, SF.(2015).Charge deformation and orbital hybridization: intrinsic mechanisms on tunable chromaticity of Y3Al5O12:Ce3+ luminescence by doping Gd3+ for warm white LEDs.SCIENTIFIC REPORTS,5,—.
MLA	Chen, L,et al."Charge deformation and orbital hybridization: intrinsic mechanisms on tunable chromaticity of Y3Al5O12:Ce3+ luminescence by doping Gd3+ for warm white LEDs".SCIENTIFIC REPORTS 5(2015):—.