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首页> 外文期刊>Journal of Materials Chemistry, C. materials for optical and electronic devices >Effect of Gd/La substitution on the phase structures and luminescence properties of (La, Gd)Sr2AlO5:Ce3+ solid solution phosphors
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Effect of Gd/La substitution on the phase structures and luminescence properties of (La, Gd)Sr2AlO5:Ce3+ solid solution phosphors

机译：Gd / La取代对（La，Gd）Sr2AlO5：Ce3 +固溶体荧光粉相结构和发光性能的影响

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摘要

A series of yellow-emitting La0.975-xGdxSr2AlO5:0.025Ce(3+) phosphors have been synthesized by a solid-state reaction. All the samples retain the same tetragonal crystal structure, and the phosphors emit yellow emission with a peak maximum shifting from 540 nm to 556 nm, depending on the Gd/La ratio, when excited by 440 nm blue light. Their temperature dependent photoluminescence, fluorescence decay curves, and CIE values were also discussed. With increasing Gd/La ratio, the red-shift behaviors can be ascribed to the enhancing covalence, and the emission intensities first increased, then decreased, and finally increased to the maximum at x = 0.6. A white light-emitting diode (w-LED) lamp was fabricated based on the selected yellow-emitting La0.375Gd0.6Sr2AlO5:0.025Ce(3+) phosphors combined with a 460 nm blue-emitting InGaN chip. The packaged w-LED lamp gave CIE chromaticity coordinates of (0.3562, 0.3660) with a warm color temperature of 4664 K and a color rendering index of 83.
机译：通过固相反应合成了一系列发黄光的La0.975-xGdxSr2AlO5：0.025Ce（3+）荧光粉。所有样品均保持相同的四方晶体结构，并且当被440 nm蓝光激发时，磷光体会发出黄光，其最大峰值根据Gd / La比从540 nm移至556 nm。还讨论了它们的温度依赖性光致发光，荧光衰减曲线和CIE值。随着Gd / La比的增加，红移行为可归因于共价的提高，并且发射强度先增加，然后降低，最后在x = 0.6时增加到最大值。基于选定的发黄光的La0.375Gd0.6Sr2AlO5：0.025Ce（3+）磷光体与460 nm发射蓝光的InGaN芯片组合，制造了白光发光二极管（w-LED）灯。包装好的w-LED灯的CIE色度坐标为（0.3562，0.3660），暖色温为4664 K，显色指数为83。

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