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Manipulation of upconversion property and enhancement of sensitivity by tailoring the local structure
Journal of the American Ceramic Society ( IF 3.5 ) Pub Date : 2020-09-22 , DOI: 10.1111/jace.17485 Fengqin Lai 1, 2 , Hao Cheng 1 , Zhong Jiang 1 , Chao Liu 1 , Tongxiang Liang 1 , Weixiong You 1, 3
Journal of the American Ceramic Society ( IF 3.5 ) Pub Date : 2020-09-22 , DOI: 10.1111/jace.17485 Fengqin Lai 1, 2 , Hao Cheng 1 , Zhong Jiang 1 , Chao Liu 1 , Tongxiang Liang 1 , Weixiong You 1, 3
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Tailoring the local crystal environment around the activators is one of an important way to enhance the upconversion (UC) luminescence intensity. Herein, we substitute the Y3+ lattice with La3+ ion gradually in Y2Ti2O7:Yb3+, Er3+ phosphor and investigate the effect of La3+ concentration on the UC luminescent properties as well as the temperature sensing behaviors. During the phase transformation process from cubic Y2Ti2O7 to monoclinic La2Ti2O7, the La3+ ions also play an important role on the adjustment of size and morphology of particles. Furthermore, the cooperation of La3+ ion is in favor of the crystal growth toward the easy growth directions. The UC luminescence intensities can be enhanced efficiently with the increasing of La3+ concentration. The sensitivity for temperature sensing can be improved by the increasing of La3+ concentration in the Y2Ti2O7 and La2Ti2O7 two‐phase coexistence system and the maximum SA is 45.3 × 10−4 K−1 at 410K when the La3+ concentration is 80%. The maximum SA and corresponding temperature can be adjusted by controlling the La3+ concentration, which means that (Y0.94‐xLax)2Ti2O7: Er3+/Yb3+ phosphors may be applicable to different working environment.
中文翻译：
通过调整局部结构来操纵上转换特性并增强灵敏度
调整活化剂周围的局部晶体环境是增强上转换（UC）发光强度的重要方法之一。在本文中，我们在Y 2 Ti 2 O 7：Yb 3+，Er 3+荧光粉中用La 3+离子逐渐取代Y 3+晶格，并研究La 3+浓度对UC发光性能和温度的影响感知行为。在从立方Y 2 Ti 2 O 7到单斜La 2 Ti 2 O 7的相变过程中，La 3+离子在调节颗粒大小和形态方面也起着重要作用。此外，La 3+离子的配合有利于晶体向容易的生长方向生长。随着La 3+浓度的增加，可以有效地提高UC的发光强度。通过增加Y 2 Ti 2 O 7和La 2 Ti 2 O 7两相共存系统中La 3+的浓度可以提高温度感测的灵敏度，并且最大S A为45.3×10 -4 K -1在410K时3+浓度为80％。可以通过控制La 3+的浓度来调节最高S A和相应的温度，这意味着（Y 0.94-x La x）2 Ti 2 O 7：Er 3+ / Yb 3+荧光粉可能适用于不同的工作环境。
更新日期：2020-11-22
中文翻译：
通过调整局部结构来操纵上转换特性并增强灵敏度
调整活化剂周围的局部晶体环境是增强上转换（UC）发光强度的重要方法之一。在本文中，我们在Y 2 Ti 2 O 7：Yb 3+，Er 3+荧光粉中用La 3+离子逐渐取代Y 3+晶格，并研究La 3+浓度对UC发光性能和温度的影响感知行为。在从立方Y 2 Ti 2 O 7到单斜La 2 Ti 2 O 7的相变过程中，La 3+离子在调节颗粒大小和形态方面也起着重要作用。此外，La 3+离子的配合有利于晶体向容易的生长方向生长。随着La 3+浓度的增加，可以有效地提高UC的发光强度。通过增加Y 2 Ti 2 O 7和La 2 Ti 2 O 7两相共存系统中La 3+的浓度可以提高温度感测的灵敏度，并且最大S A为45.3×10 -4 K -1在410K时3+浓度为80％。可以通过控制La 3+的浓度来调节最高S A和相应的温度，这意味着（Y 0.94-x La x）2 Ti 2 O 7：Er 3+ / Yb 3+荧光粉可能适用于不同的工作环境。
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