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Highly efficient near-infrared phosphor LaMgGa11O19:Cr3+
Inorganic Chemistry Frontiers ( IF 6.1 ) Pub Date : 2020/02/17 , DOI: 10.1039/d0qi00063a Shengqiang Liu 1, 2, 3, 4, 5 , Zhizhen Wang 1, 2, 3, 4, 5 , Hao Cai 1, 2, 3, 4, 5 , Zhen Song 1, 2, 3, 4, 5 , Quanlin Liu 1, 2, 3, 4, 5
Inorganic Chemistry Frontiers ( IF 6.1 ) Pub Date : 2020/02/17 , DOI: 10.1039/d0qi00063a Shengqiang Liu 1, 2, 3, 4, 5 , Zhizhen Wang 1, 2, 3, 4, 5 , Hao Cai 1, 2, 3, 4, 5 , Zhen Song 1, 2, 3, 4, 5 , Quanlin Liu 1, 2, 3, 4, 5
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Near-infrared (NIR) phosphor-converted light-emitting diodes (pc-LEDs) are desirable for in vivo imaging and applications for nondestructive examination in the food industry. Accordingly, it is very important to exploit highly efficient and stable broad-band NIR phosphors. Herein we report a Cr3+-activated LaMgGa11O19 phosphor via a simple solid-state reaction, showing broad-band emission centered at 770 nm with internal/external quantum efficiency of 82.6%/42.5%. There are three six-coordinated octahedral crystallographic sites in the structure for Cr3+ occupancy, and changing the Cr3+ concentration can tune the NIR emission with tunable band centers from 715 to 800 nm. This spectral red-shift is mainly ascribed to energy transfer among multiple Cr3+ sites, which is further confirmed by decay lifetime analysis. The phosphor also shows excellent luminescence thermal stability, and the photoluminescence intensity at 410 K maintains 87% of that at room temperature. Our work provides a novel broadband NIR emission phosphor with high efficiency and excellent thermal quenching resistance for the field of NIR spectroscopy.
中文翻译：
高效近红外荧光粉LaMgGa11O19：Cr3 +
近红外（NIR）荧光粉转换的发光二极管（pc-LED）对于体内成像以及食品工业中的无损检测应用是理想的。因此，开发高效且稳定的宽带NIR磷光体非常重要。本文中，我们通过简单的固态反应报告了Cr 3+活化的LaMgGa 11 O 19荧光粉，显示出以770 nm为中心的宽带发射，内部/外部量子效率为82.6％/ 42.5％。Cr 3+占据的结构中存在三个六配位八面体晶体学位点，并且会改变Cr 3+浓度可以在715至800 nm的波段范围内调整NIR发射。这种光谱红移主要归因于多个Cr 3+位点之间的能量转移，这通过衰减寿命分析得到了进一步证实。磷光体还显示出出色的发光热稳定性，并且在410 K下的光致发光强度保持了室温下的87％。我们的工作为NIR光谱学领域提供了一种新型的宽带NIR发射荧光粉，该荧光粉具有高效率和出色的抗热猝灭性。
更新日期：2020-03-19
中文翻译：
高效近红外荧光粉LaMgGa11O19：Cr3 +
近红外（NIR）荧光粉转换的发光二极管（pc-LED）对于体内成像以及食品工业中的无损检测应用是理想的。因此，开发高效且稳定的宽带NIR磷光体非常重要。本文中，我们通过简单的固态反应报告了Cr 3+活化的LaMgGa 11 O 19荧光粉，显示出以770 nm为中心的宽带发射，内部/外部量子效率为82.6％/ 42.5％。Cr 3+占据的结构中存在三个六配位八面体晶体学位点，并且会改变Cr 3+浓度可以在715至800 nm的波段范围内调整NIR发射。这种光谱红移主要归因于多个Cr 3+位点之间的能量转移，这通过衰减寿命分析得到了进一步证实。磷光体还显示出出色的发光热稳定性，并且在410 K下的光致发光强度保持了室温下的87％。我们的工作为NIR光谱学领域提供了一种新型的宽带NIR发射荧光粉，该荧光粉具有高效率和出色的抗热猝灭性。
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