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Co-doping effect of Mn2+on fluorescence thermostability of Ca-α-sialon:Eu2+phosphors
Ni, Jia1,2,3; Liu, Qian1,2; Zhou, Zhenzhen1,2; Liu, Guanghui1,2
2017
Source PublicationRSC Advances
Volume7Issue:67Pages:42211-42217
AbstractTo reveal transition metal manganese ion (Mn2+) co-doping influence on Ca-α-sialon:Eu2+phosphors, Mn2+and europium ion (Eu2+) co-doped Ca-α-sialon phosphors were synthesized using a solid state reaction at 1600 °C under an ambient nitrogen atmosphere, and the effects of the co-dopant Mn2+on the fluorescence thermostability of Ca-α-sialon:Eu2+phosphors were systematically investigated. With increasing Mn2+concentration, X-ray diffraction analysis shows a phase-pure host Ca-α-sialon structure and unit cell shrinkage (or a tighter structure). The photoluminescence spectra of all samples, with or without Mn2+co-doping, exhibit a strong yellow emission. For the energy transfer between Mn2+and Eu2+, the emission intensity is strongest when the co-doping concentration of Mn2+is 0.02 molar and the CIE chromaticity index of the strongest emission composition is (0.474, 0.513) with a high internal quantum efficiency of 72.4%. Importantly, the fluorescence thermal quenching behavior of the as-prepared phosphors is remarkable and is over 80% of the initial emission intensity tested at room temperature, at a higher temperature of 275 °C. The major energy transition mechanism between co-dopants Mn2+and Eu2+during the heating process was deduced and considered to be a non-radiative energy transfer and phonon-assisted tunneling. Using further calculations, the thermal activation energy, ΔE, is 0.28 eV. In consequence, Mn2+and Eu2+co-doped Ca-α-sialon is an attractive and competitive phosphor candidate for applications in white light emitting diodes. © 2017 The Royal Society of Chemistry.
DOI10.1039/c7ra06943j
EI Accession Number20173704143319
EI KeywordsPhosphors
EI Classification Number531 Metallurgy and Metallography - 741.1 Light/Optics - 802.2 Chemical Reactions
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Document Type期刊论文
Identifierhttp://ir.sic.ac.cn/handle/331005/25429
Collection中国科学院上海硅酸盐研究所
Affiliation1.State Key Laboratory of High Performance Ceramics and Superfine Microstructure, Shanghai Institute of Ceramics, Chinese Academy of Sciences, 1295 Dingxi Road, Shanghai; 200050, China;
2.Shanghai Materials Genome Institute, 99 Shangda Road, Shanghai; 200444, China;
3.University of Chinese, Academy of Sciences, 19A Yuquan Road, Beijing; 100049, China
Recommended Citation
GB/T 7714
Ni, Jia,Liu, Qian,Zhou, Zhenzhen,et al. Co-doping effect of Mn2+on fluorescence thermostability of Ca-α-sialon:Eu2+phosphors[J]. RSC Advances,2017,7(67):42211-42217.
APA Ni, Jia,Liu, Qian,Zhou, Zhenzhen,&Liu, Guanghui.(2017).Co-doping effect of Mn2+on fluorescence thermostability of Ca-α-sialon:Eu2+phosphors.RSC Advances,7(67),42211-42217.
MLA Ni, Jia,et al."Co-doping effect of Mn2+on fluorescence thermostability of Ca-α-sialon:Eu2+phosphors".RSC Advances 7.67(2017):42211-42217.
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