Feng Xin, Wang Linxiang, Maimaiti Munire, Jiang Mengliang, Zhang Yan
School of Physics and Electronic Engineering, Xinjiang Normal University, Urumqi, Xinjiang 830054, China; Xinjiang Key Laboratory for Luminescence Minerals and Optical Functional Materials, Xinjiang Normal University, Urumqi, Xinjiang 830054, China.
School of Physics and Electronic Engineering, Xinjiang Normal University, Urumqi, Xinjiang 830054, China; Xinjiang Key Laboratory for Luminescence Minerals and Optical Functional Materials, Xinjiang Normal University, Urumqi, Xinjiang 830054, China.
Spectrochim Acta A Mol Biomol Spectrosc. 2025 Jan 5;324:124959. doi: 10.1016/j.saa.2024.124959. Epub 2024 Aug 10.
A series of x%Ho, 5 %Tm, y%Yb:BiWO (x = 0, 0.5, 1, 3, 5; y = 0.5, 1, 3) luminescent materials was prepared using a high-temperature solid-phase method. The microstructure, up-conversion luminescence, and temperature sensing properties of the synthesized powders were analyzed. X-ray diffraction patterns revealed that doping with Ho, Tm, and Yb ions at certain concentrations did not affect the orthorhombic crystal structure of the BiWO host. Scanning electron microscopy revealed that the morphology of the sample consisted of lumpy particles with a particle size range of 1-5 µm and agglomeration. SEM mapping and energy-dispersive X-ray spectroscopy analyses revealed that each element was relatively uniformly distributed on the particle surface. Under 980 nm excitation (380 mW), the strongest luminescence of the sample was obtained when both Ho and Yb doping concentrations were 1 %. Compared with the luminescence of the 5 %Tm and 1 %Yb:BiWO sample, with increasing Ho concentrations, the luminescence intensity of Tm was first enhanced and subsequently weakened, whereas the luminescence of Ho was significantly weakened, which indicates the positive energy transfer from Ho → Tm. At 980 nm (80-380 mW), for the 1 %Ho, 5 %Tm, and 1 %Yb:BiWO sample, the 538 nm, 545 nm, 660 nm, and 804 nm emission peaks originated from the two-photon absorption. FIR, FIR, and FIR were used to characterize the temperature and corresponded to temperature sensitivities S of 0.0046 K, 0.022 K and 0.024 K at 573 K, respectively. At 498 K, the minimum temperature resolution δT values were 0.03384 K, 0.03203 K and 0.04373 K. When the temperature increased from 298 K to 573 K, the powder sample luminescence gradually shifted from the yellow-green region to the red region. The results of environmental discoloration and thermochromic performance tests indicate that this sample has potential application in optical anti-counterfeiting. FIR and FIR were obtained for the 40 NTU turbidity suspension under identical excitation conditions. At 298 K, for the 40 NTU turbidity sample, the maximum S values were 0.0197 K and 0.0405 K; at 340 K, the minimum temperature resolutions δT values were 0.54037 K and 0.66237 K. When the temperature decreased from 340 K to 298 K, the luminescence of the 40 NTU suspension samples gradually shifted from the yellow region to the green region.
采用高温固相法制备了一系列x%Ho、5%Tm、y%Yb:BiWO（x = 0、0.5、1、3、5；y = 0.5、1、3）发光材料。对合成粉末的微观结构、上转换发光和温度传感特性进行了分析。X射线衍射图谱表明，在一定浓度下掺杂Ho、Tm和Yb离子不影响BiWO基质的正交晶体结构。扫描电子显微镜显示，样品的形貌由粒径范围为1 - 5 µm的块状颗粒及团聚体组成。扫描电子显微镜映射和能量色散X射线光谱分析表明，各元素在颗粒表面分布相对均匀。在980 nm激发（380 mW）下，当Ho和Yb掺杂浓度均为1%时，样品获得最强发光。与5%Tm和1%Yb:BiWO样品的发光相比，随着Ho浓度增加，Tm的发光强度先增强后减弱，而Ho的发光显著减弱，这表明存在从Ho→Tm的正向能量转移。在980 nm（80 - 380 mW）下，对于1%Ho、5%Tm和1%Yb:BiWO样品，538 nm、545 nm、660 nm和804 nm发射峰源于双光子吸收。利用FIR、FIR和FIR表征温度，在573 K时对应的温度灵敏度S分别为(0.0046 K^{-1})、(0.022 K^{-1})和(0.024 K^{-1})。在498 K时，最小温度分辨率δT值分别为0.03384 K（疑似有误，原文此处单位可能应为(K^{-1})）、0.03203 K（疑似有误，原文此处单位可能应为(K^{-1})）和0.04373 K（疑似有误，原文此处单位可能应为(K^{-1})）。当温度从298 K升高到573 K时，粉末样品发光逐渐从黄绿色区域向红色区域移动。环境变色和热致变色性能测试结果表明，该样品在光学防伪方面具有潜在应用。在相同激发条件下获得了40 NTU浊度悬浮液的FIR和FIR。在298 K时，对于40 NTU浊度样品，最大S值分别为(0.0197 K^{-1})和(0.0405 K^{-1})；在340 K时，最小温度分辨率δT值分别为0.54037 K（疑似有误，原文此处单位可能应为(K^{-1})）和0.66237 K（疑似有误，原文此处单位可能应为(K^{-1})）。当温度从340 K降低到298 K时，40 NTU悬浮液样品的发光逐渐从黄色区域向绿色区域移动。
原文中多次出现FIR表述，疑似有误，未明确其准确含义，已按原样翻译。同时，部分温度相关数值后的单位疑似有误，已在译文中注明。
