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首页> 外文期刊>Materials Science and Engineering >Energy transfer dynamics in thermally stable single-phase LiMgBO_3:Tm~(3+)/Dy~(3+) phosphor for UV triggered white light-emitting devices
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Energy transfer dynamics in thermally stable single-phase LiMgBO_3:Tm~(3+)/Dy~(3+) phosphor for UV triggered white light-emitting devices

机译:用于UV触发白光器件的热稳定单相LiMGBO_3:TM〜(3 +)/ DY〜(3+)磷光体的能量转移动力学

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摘要

We report on thermal-, structural-, optical-, and energy transfer (ET)-based photoluminescence (PL) characteristics of Tm~(3+) co-doped with Dy~(3+) in a single-phase LiMgBO_3 host material. Tm~(3+) exhibits vibrant blue emission (~1D_2→~3F_4: 456 nm) and Dy~(3+) displays strong yellowish-white emission (~4F_(9/2)→~6H_(13/2): 573 nm) under ultraviolet (UV) excitation. When the optimum concentration (0.03) of Tm~(3+) is co-doped with different amounts of Dy~(3+), the PL intensity of Tm~(3+): ~1D_2→~3F_4 declines but increases for Dy~(3+): ~4F_(9/2)→~6H_J (J = 11/2, 13/2, 15/2), which suggests ET from Tm~(3+)→Dy~(3+) and demonstrates electric dipole-dipole interaction with a critical distance of 11.07 A. The ET between Tm~(3+) and Dy~(3+) is validated from the spectral overlap of Tm~(3+) PL and Dy~(3+) absorption, Tm~(3+)/Dy~(3+) PL spectra, Tm~(3+)-dependent lifetimes, and ET parameters such as efficiency and probability. The Commission Internationale de l'Eclairage (CIE) coordinates display the color tunability of Tm~(3+) phosphor from blue light (0.146, 0.045) to warm white light (0.334, 0.306) with a correlated color temperature (CCT) value of 5,404 K in response to Dy~(3+) doping. The PL intensity of LiMgBO_3:0.03Tm~(3+)/0.05Dy~(3+) increases nearly two-fold on co-doping with 5% Li~+ as a charge compensator. Tm~(3+)/Dy~(3+)/Li~+ co-activated material exhibits good thermal stability, retaining 64% of the initial PL intensity, which suggests its practical applicability as UV light triggered white light-emitting devices.
机译:我们在单相LiMGBO_3主机材料中将TM〜(3+)的热 - 结构,光学和能量转移(ET)的基于光致发光(et)的特性报告。 TM〜(3+)表现出充满活力的蓝色发射(〜1d_2→〜3f_4:456nm)和dy〜(3+)显示出强烈的黄白色发射(〜4f_(9/2)→〜6h_(13/2): 573nm)在紫外线(紫外线)激发下。当Tm〜(3+)的最佳浓度(0.03)是共掺杂有不同量的Dy〜(3+)时,Tm〜(3+):〜1d_2→〜3f_4的Pl强度下降但Dy增加〜(3+):〜4f_(9/2)→〜6h_j(j = 11/2,13 / 2,15/2),表明et从tm〜(3+)→dy〜(3+)和用临界距离为11.07a表示电偶极子偶极偏移。从TM〜(3+)PL和DY的光谱重叠验证TM〜(3+)和DY〜(3+)之间的ET〜(3+) )吸收,TM〜(3 +)/ DY〜(3+)PL光谱,TM〜(3 +) - 依赖的寿命,以及诸如效率和概率的ET参数。委员会Internationale de L'EclaReage(CIE)坐标从蓝光(0.146,0.5)到温暖的白光(0.334,0.306),展示TM〜(3+)磷光体的颜色可调性,具有相关的色温(CCT)值5,404 k响应Dy〜(3+)掺杂。 LiMGBO_3:0.03Tm〜(3 +)/ 0.05〜(3+)的PL强度增加了几乎两倍的共掺杂,用5%Li +作为电荷补偿器。 TM〜(3 +)/ DY〜(3 +)/ Li +共振材料表现出良好的热稳定性,保留64%的初始PL强度,这表明其作为紫外光触发的白色发光器件的实际适用性。

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