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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; Wang, Y; Chen, SF; Chen, L (reprint author), Hefei Univ Technol, Sch Mat Sci & Engn, Hefei 230009, Peoples R China. | |
| 2015 | |
| Source Publication | SCIENTIFIC REPORTS
 |
| ISSN | 2045-2322 |
| Volume | 5Pages:— |
| Subtype | 期刊文献 |
| Abstract | 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. |
| Keyword | Temperature-gradient Technique Electronic-structure Garnet Phosphors Single-crystals Yag Crystals Photoluminescence Emission Light Ce3++ |
| Indexed By | SCI |
| Language | 英语 |
| WOS ID | WOS:000357921900001 |
| Citation statistics | |
| Document Type | 期刊论文 |
| Identifier | http://ir.sinap.ac.cn/handle/331007/24884 |
| Collection | 中科院上海应用物理研究所2011-2019年 |
| Corresponding Author | Chen, L (reprint author), Hefei Univ Technol, Sch Mat Sci & Engn, Hefei 230009, Peoples R China. |
| Recommended Citation 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, L .(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):—. |
| Files in This Item: | ||||||
| File Name/Size | DocType | Version | Access | License | ||
| Charge deformation a（2703KB） | 期刊论文 | 作者接受稿 | 开放获取 | CC BY-NC-SA | View Download | |
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