Upconversion luminescence and temperature-sensing properties of Ho3+/Yb3+-codoped ZnWO4 phosphors based on fluorescence intensity ratios
Upconversion luminescence and temperature-sensing properties of Ho3+/Yb3+-codoped ZnWO4 phosphors based on fluorescence intensity ratios
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基于荧光强度比的Ho3/Yb3共掺杂ZnWO4荧光粉的上转换发光和温度传感特性
DOI：
10.1039/c7ra05846b
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发表时间：
2017-01-01
期刊：
影响因子：
3.9
通讯作者：
Yao, Xi
中科院分区：
文献类型：
--
作者：
Chai, Xiaona;Li, Jun;Yao, Xi
采用固相反应法合成了Ho 3 +/Yb 3+共掺杂ZnWO 4荧光粉，研究了其结构、上转换发光和温敏特性。所得ZnWO 4：0.01Ho（3+）/xYb（3+）荧光粉为单斜晶系，空间群为P2/c。在980 nm激发下，观察到明亮的绿色[（F-5（4），S-5（2））-> I-5（8）]、弱红色（F-5（5）-> I-5（8））和近红外发射[（F-5（4），S-5（2））-> I-5（7）]。在ZnWO 4中，Ho 3+和Yb 3+的最佳掺杂浓度分别为0.01和0.15。在83-503 K范围内，研究了近红外-绿色（I-757/I-540）和红-绿光（I-641，I-665/I-540，I-549）荧光强度比（FIRs）随温度的变化。讨论了ZnWO 4：0.01 Ho（3+）/0.15 Yb（3+）荧光粉的灵敏度，并利用四能级系统和红、绿色发光强度比分析了其作为热传感器在发光测温中的潜在应用。ZnWO_4：0.01Ho（3+）/0.15Yb（3+）荧光粉作为光温敏材料具有潜在的应用前景。
Ho3+/Yb3+-codoped ZnWO4 phosphors were synthesized using a solid state reaction method and their structures, upconversion (UC) luminescence, and temperature- sensing properties were investigated. The obtained ZnWO4:0.01Ho(3+)/xYb(3+) phosphors crystallized in the monoclinic phase with space group P2/c. Under 980 nm excitation, bright green [(F-5(4), S-5(2)) -> I-5(8)], weak red (F-5(5) -> I-5(8)), and near-infrared emissions [(F-5(4), S-5(2)) -> I-5(7)] were observed. The optimal Ho3+ and Yb3+ doping concentrations in ZnWO4 were 0.01 and 0.15, respectively. The near-infrared-green (I-757/I-540) and red-green (I-641,I-665/I-540,I-549) fluorescence intensity ratios (FIRs) were studied as a function of temperature at 83-503 K. The sensitivity of the ZnWO4:0.01Ho(3+)/0.15Yb(3+) phosphors was also discussed and their potential application as thermal sensors in luminescence thermometry was analyzed using a four-level system and the intensity ratio of the red and green emissions. ZnWO4: 0.01Ho(3+)/0.15Yb(3+) phosphors could potentially be applied as optical temperature- sensing materials.