Bright and Persistent Green Emitting MgGa2O4:Mn2+ for Phosphor Converted White Light Emitting Diodes

IF 3.5 3区化学 Q2 CHEMISTRY, INORGANIC & NUCLEAR

Dalton Transactions Pub Date : 2024-11-18 DOI:10.1039/d4dt02960g

Reshmi Thekke Parayil, Santosh Kumar Gupta, Malini Abraham, Deepak Tyagi, Subrata Das, Mohit Tyagi, Narendra Singh Rawat, Manoj Mohapatra

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引用次数: 0

Abstract

Narrow band green emitting phosphors have got widespread attention due to their application in white light emitting diodes (WLEDs) backlight displays. The commercial backlight displays are having a broad band green phosphor which limits their performance. In this work, bright, narrow and thermally stable green emitting MgGa2O4:Mn2+ (MGO-Mn) has been synthesized Time-resolved emission spectroscopy suggested that Mn2+ ions are distributed at both Mg2+ and Ga3+ sites in MGO spinel which resulted in high internal quantum efficiency of 63%. The colour purity of the MGO-Mn (76.4%) superseded that of commercial green phosphor β-SiAlON:Eu2+ (59.12%). Doping induced creation of oxygen vacancy impart MGO-Mn with excellent persistent luminescence with time duration of more than 900 sec on 1 min charging with 270 nm UV light and persistence radioluminescence of more than 6000 sec when charged with X-rays for 1 min. Finally, tunable white LEDs (cool and neutral white LED) are fabricated by combining the RGB mixture of the green phosphor with commercial red and blue phosphor along with a 280 nm UV LED chip. This work also provides importance of different annealing atmosphere on the photoluminescence and persistence luminescence of the MGO-Mn phosphor.

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用于荧光粉转换白光发光二极管的明亮持久的绿色发光 MgGa2O4:Mn2+

窄带绿色发光荧光粉因其在白光发光二极管（WLED）背光显示器中的应用而受到广泛关注。商用背光显示器使用的是宽带绿色荧光粉，这限制了其性能。这项研究合成了明亮、窄带和热稳定的绿色发光 MgGa2O4:Mn2+ （MGO-Mn）。时间分辨发射光谱表明，Mn2+ 离子分布在 MGO 尖晶石中的 Mg2+ 和 Ga3+ 位点上，从而产生了高达 63% 的内部量子效率。MGO-Mn 的色纯度（76.4%）超过了商用绿色荧光粉 β-SiAlON:Eu2+（59.12%）。掺杂诱导产生的氧空位赋予 MGO-Mn 极佳的持续发光性能，在 270 纳米紫外光下充电 1 分钟后，持续发光时间超过 900 秒；在 X 射线下充电 1 分钟后，持续放射发光时间超过 6000 秒。最后，通过将绿色荧光粉的 RGB 混合物与商用红色和蓝色荧光粉以及 280 纳米紫外线 LED 芯片相结合，制造出了可调白光 LED（冷白光和中性白光 LED）。这项工作还提供了不同退火气氛对 MGO-Mn 荧光粉的光致发光和持续发光的重要性。

本文章由计算机程序翻译，如有差异，请以英文原文为准。

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来源期刊

Dalton Transactions 化学-无机化学与核化学

CiteScore

6.60

自引率

7.50%

发文量

1832

审稿时长

1.5 months

期刊介绍： Dalton Transactions is a journal for all areas of inorganic chemistry, which encompasses the organometallic, bioinorganic and materials chemistry of the elements, with applications including synthesis, catalysis, energy conversion/storage, electrical devices and medicine. Dalton Transactions welcomes high-quality, original submissions in all of these areas and more, where the advancement of knowledge in inorganic chemistry is significant.