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Phase evolution, structure, and up‐/down‐conversion luminescence of Li6CaLa2Nb2O12:Yb3+/RE3+ phosphors (RE = Ho, Er, Tm)
Journal of the American Ceramic Society ( IF 3.5 ) Pub Date : 2020-01-06 , DOI: 10.1111/jace.16977 Panpan Du 1, 2 , Jing Ma 1, 2, 3 , Qi Zhu 1, 2, 4 , Ji‐Guang Li 4
Journal of the American Ceramic Society ( IF 3.5 ) Pub Date : 2020-01-06 , DOI: 10.1111/jace.16977 Panpan Du 1, 2 , Jing Ma 1, 2, 3 , Qi Zhu 1, 2, 4 , Ji‐Guang Li 4
Affiliation
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Garnet‐type Li6Ca(La0.97Yb0.02RE0.01)2Nb2O12 (RE = Ho, Er, Tm) new phosphors were successfully synthesized via solid reaction at 900°C for 5 hours, whose course of phase evolution, macroscopic/local crystal structure and up‐/down‐conversion (UC/DC) photoluminescence were clarified. Mechanistic study and materials characterization were attained via XRD, Rietveld refinement, DTA/TG, electron microscopy (FE‐SEM/TEM), and Raman/reflectance/fluorescence spectroscopies. The phosphors were shown to exhibit UC luminescence dominated by a ~ 553 nm green band (5F4/5S2 → 5I8 transition) for Ho3+, a ~ 568 nm green band (4S3/2 → 4I15/2 transition) for Er3+ and a ~ 806 nm near‐infrared band (3H4 → 3H6 transition) for Tm3+ under 978 nm laser excitation, with CIE chromaticity coordinates of around (0.31, 0.68), (0.38, 0.60) and (0.17, 0.24), respectively. Analysis of the pump‐power dependence of UC intensity indicated that all the emissions involve a two‐photon mechanism except for the ~ 486 nm blue emission of Tm3+ (1G4 → 3H6), which requires a three‐photon process. The DC luminescence of these phosphors is featured by dominant bands at ~ 553 nm for Ho3+ (green, 5F4/5S2 → 5I8 transition), ~568 nm for Er3+ (green, 4S3/2 → 4I15/2 transition) and ~ 464 nm for Tm3+ (blue, 1D2 → 3F4 transition). The UC and DC properties were also comparatively discussed.
中文翻译：
Li6CaLa2Nb2O12：Yb3 + / RE3 +荧光粉的相演化，结构和上/下转换发光（RE = Ho，Er，Tm）
石榴石型Li 6 Ca（La 0.97 Yb 0.02 RE 0.01）2 Nb 2 O 12（RE = Ho，Er，Tm）通过在900°C下固相反应5小时成功合成了新型磷光体，其相变过程为：阐明了宏观/局部晶体结构和上/下转换（UC / DC）光致发光。通过XRD，Rietveld精制，DTA / TG，电子显微镜（FE-SEM / TEM）和拉曼/反射/荧光光谱学进行了机理研究和材料表征。所述磷光体显示表现出UC发光通过〜553纳米的绿光波段支配（5 ˚F 4 / 5小号2 → Ho 3+的5 I 8跃迁），Er 3+的〜568 nm绿带（4 S 3/2 → 4 I 15/2跃迁）和约806 nm的近红外谱带（3 H 4 → 3 Tm 3+在978 nm激光激发下的H 6跃迁），CIE色度坐标分别约为（0.31、0.68），（0.38、0.60）和（0.17、0.24）。对UC强度的泵浦功率依赖性的分析表明，除了〜486 nm的Tm 3+（1 G4 → 3 H 6），这需要三光子过程。这些荧光体的发光DC通过主导带在含有Ho〜553纳米的特征3+（绿色，5 ˚F 4 / 5 š 2 → 5我8转变）为铒，〜568纳米3+（绿色，4 s ^ 3 / 2 → 4 I 15/2跃迁）和〜464 nm对于Tm 3+（蓝色，1 D 2 → 3 F 4跃迁）。UC和DC属性也进行了比较讨论。
更新日期：2020-01-06
中文翻译：
Li6CaLa2Nb2O12：Yb3 + / RE3 +荧光粉的相演化，结构和上/下转换发光（RE = Ho，Er，Tm）
石榴石型Li 6 Ca（La 0.97 Yb 0.02 RE 0.01）2 Nb 2 O 12（RE = Ho，Er，Tm）通过在900°C下固相反应5小时成功合成了新型磷光体，其相变过程为：阐明了宏观/局部晶体结构和上/下转换（UC / DC）光致发光。通过XRD，Rietveld精制，DTA / TG，电子显微镜（FE-SEM / TEM）和拉曼/反射/荧光光谱学进行了机理研究和材料表征。所述磷光体显示表现出UC发光通过〜553纳米的绿光波段支配（5 ˚F 4 / 5小号2 → Ho 3+的5 I 8跃迁），Er 3+的〜568 nm绿带（4 S 3/2 → 4 I 15/2跃迁）和约806 nm的近红外谱带（3 H 4 → 3 Tm 3+在978 nm激光激发下的H 6跃迁），CIE色度坐标分别约为（0.31、0.68），（0.38、0.60）和（0.17、0.24）。对UC强度的泵浦功率依赖性的分析表明，除了〜486 nm的Tm 3+（1 G4 → 3 H 6），这需要三光子过程。这些荧光体的发光DC通过主导带在含有Ho〜553纳米的特征3+（绿色，5 ˚F 4 / 5 š 2 → 5我8转变）为铒，〜568纳米3+（绿色，4 s ^ 3 / 2 → 4 I 15/2跃迁）和〜464 nm对于Tm 3+（蓝色，1 D 2 → 3 F 4跃迁）。UC和DC属性也进行了比较讨论。
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