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首页> 美国卫生研究院文献>Light Science Applications >Quenching of the red Mn4+ luminescence in Mn4+-doped fluoride LED phosphors
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Quenching of the red Mn4+ luminescence in Mn4+-doped fluoride LED phosphors

机译：掺杂Mn4 +的氟化物LED荧光粉中的Mn4 +红色发光的猝灭

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摘要

Red-emitting Mn4+-doped fluorides are a promising class of materials to improve the color rendering and luminous efficacy of white light-emitting diodes (w-LEDs). For w-LEDs, the luminescence quenching temperature is very important, but surprisingly no systematic research has been conducted to understand the mechanism for thermal quenching in Mn4+-doped fluorides. Furthermore, concentration quenching of the Mn4+ luminescence can be an issue but detailed investigations are lacking. In this work, we study thermal quenching and concentration quenching in Mn4+-doped fluorides by measuring luminescence spectra and decay curves of K2TiF6:Mn4+ between 4 and 600 K and for Mn4+ concentrations from 0.01% to 15.7%. Temperature-dependent measurements on K2TiF6:Mn4+ and other Mn4+-doped phosphors show that quenching occurs through thermally activated crossover between the 4T2 excited state and 4A2 ground state. The quenching temperature can be optimized by designing host lattices in which Mn4+ has a high 4T2 state energy. Concentration-dependent studies reveal that concentration quenching effects are limited in K2TiF6:Mn4+ up to 5% Mn4+. This is important, as high Mn4+ concentrations are required for sufficient absorption of blue LED light in the parity-forbidden Mn4+ d–d transitions. At even higher Mn4+ concentrations (>10%), the quantum efficiency decreases, mostly due to direct energy transfer to quenching sites (defects and impurity ions). Optimization of the synthesis to reduce quenchers is crucial for developing more efficient highly absorbing Mn4+ phosphors. The present systematic study provides detailed insights into temperature and concentration quenching of Mn4+ emission and can be used to realize superior narrow-band red Mn4+ phosphors for w-LEDs.
机译：发出红光的Mn 4 + 掺杂的氟化物是一类有前途的材料，可改善白色发光二极管（w-LED）的显色性和发光效率。对于w-LED，发光猝灭温度非常重要，但是令人惊讶的是，尚未进行系统的研究来了解掺杂Mn 4 + 的氟化物的热猝灭机理。此外，Mn 4 + 发光的浓度猝灭可能是一个问题，但缺乏详细的研究。在这项工作中，我们通过测量4和600FK之间的K2TiF6：Mn 4 + 的发光光谱和衰减曲线，研究了Mn 4 + 掺杂的氟化物中的热猝灭和浓度猝灭。 Mn 4 + 的浓度范围为0.01％至15.7％。对K2TiF6：Mn 4 + 和其他Mn 4 + 掺杂的磷光体的温度依赖性测量表明，淬灭是通过 4 之间的热活化交叉发生的T2激发态和 4 A2基态。通过设计Mn 4 + 具有高 4 T2态能的主晶格可以优化淬火温度。浓度依赖的研究表明，浓度猝灭作用在K2TiF6：Mn 4 + 中受到限制，直至5％Mn 4 + 。这很重要，因为要在奇偶禁止的Mn 4 + d–d过渡中充分吸收蓝色LED光线，需要高Mn 4 + 浓度。在甚至更高的Mn 4 + 浓度（> 10％）下，量子效率下降，主要是由于直接的能量转移到淬灭位点（缺陷和杂质离子）。为了减少猝灭剂，合成的优化对于开发更有效的高吸收性Mn 4 + 荧光粉至关重要。本系统研究提供了有关Mn 4 + 发射的温度和浓度猝灭的详细见解，可用于实现w-LED的优异的窄带红色Mn 4 + 荧光粉。

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