镧系元素掺杂无铅双钙钛矿 La2MgTiO6 作为超亮多色 LED 和新型自校准分区光学温度计,Inorganic Chemistry Frontiers

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镧系元素掺杂无铅双钙钛矿 La2MgTiO6 作为超亮多色 LED 和新型自校准分区光学温度计
Inorganic Chemistry Frontiers ( IF 6.1 ) Pub Date : 2023-05-02 , DOI: 10.1039/d3qi00529a
Keming Zhu ₁ , Hanyu Xu ₁ , Zhiying Wang ₁ , Zuoling Fu ₁

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镧系元素在光电研究中的无限潜力引发了对理想主体材料的寻找。在此，基于双钙钛矿 La ₂ MgTiO _{6优异的镧系元素相容性}，成功构建了具有四种模式的光响应多功能荧光粉（模式 I-IV：Tm-Yb；Er-Yb；Ho-Yb；Er/Tm-Yb）。在系统探索四种模式背后的高纯度和亮度上转换 (UC) 光致发光的内部机制后，制造了强绿色、蓝色和近白色发光二极管 (LED)。此外，针对监测波段的不同发射能量水平，利用热耦合或非热耦合发光强度比（LIR）技术对模式I-IV的温度传感性能进行了严格评估。所有模式都展示了出色的温度测量潜力、稳定性和可重复性。特别是在模式四中，成功设计了一种新型自校准分区温度计，其双发射中心源自 Er/Tm，可为低温、中温和高温三个区域提供特定的 LIR，最终在超宽范围内实现高相对灵敏度温度范围。结果表明，所合成的多功能荧光粉突破了单一材料中镧系元素掺杂类型的限制，可实现应用功能的多样化，开启了先进多功能材料设计的新篇章。

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Lanthanide-doped lead-free double perovskite La2MgTiO6 as ultra-bright multicolour LEDs and novel self-calibrating partition optical thermometer

The infinite potential of lanthanide in optoelectronic research has triggered the search for ideal host materials. Herein, based on the excellent lanthanide compatibility of double perovskite La₂MgTiO₆, light-responsive multifunctional phosphors with four modes were successfully constructed (Modes I–IV: Tm–Yb; Er–Yb; Ho–Yb; Er/Tm–Yb). After systematically exploring the internal mechanism of high-purity and brightness upconversion (UC) photoluminescence behind the four modes, intense green, blue and near-white lighting-emitting diodes (LEDs) were fabricated. Besides, aiming at the different emission energy levels of the monitored bands, the temperature-sensing performance of Modes I–IV was strictly evaluated utilizing thermally coupled or non-thermally-coupled luminescence intensity ratio (LIR) techniques. All the modes demonstrate excellent temperature measurement potential, stability and repeatability. Especially in Mode IV, a novel self-calibrating partition thermometer with dual-emitting centers originating from Er/Tm was designed successfully, which can provide specific LIR for three regions of low temperature, medium temperature and high temperature, and finally achieve high relative sensitivity over an ultra-wide temperature range. The results testify that the as-synthesized multifunctional phosphors break through the limitation of lanthanide doping types in a single material, which can realize the diversification of application functions and launch a new chapter for the design of advanced multifunctional materials.

更新日期：2023-05-02

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