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首页> 外文期刊>Japanese Journal of Applied Physics. Part 1, Regular Papers, Brief Communications & Review Papers >Flame Spray Pyrolysis for Preparing Red-Light-Emitting, Submicron-Sized Luminescent Strontium Titanate Particles
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Flame Spray Pyrolysis for Preparing Red-Light-Emitting, Submicron-Sized Luminescent Strontium Titanate Particles

机译：火焰喷雾热解法制备发红光的亚微米级发光钛酸锶粒子

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摘要

SrTiO_3:Pr~(3+),Al~(3+) red-light-emitting phosphor particles were directly prepared by flame spray pyrolysis without any post-heat treatments. The morphology, crystallinity and photoluminescence (PL) of the as-prepared SrTiO_3:Pr~(3+),Al~(3+) particles were systematically investigated. The as-prepared particles showed good morphological characteristics and a high crystallinity. The geometric mean diameters of the particles ranged from 0.53 to 0.70 μm. The particles showed a bright red emission at 615 nm from ~1D_2-~3H_4 transition under 365 nm excitation. Optimization to the enhance PL was conducted by systematically controlling gas flow rates, and activator, additive and salt-flux concentrations. The highest PL intensity at 615 nm was obtained at Pr/Ti and Al/Ti molar ratios of 0.001 and 0.03, respectively, and a 40 mol % LiNO_3 flux. The photoluminescence intensity of submicron-sized SrTiO_3:Pr~(3+),Al~(3+) particles prepared under the optimal synthetic conditions was as high as 107% that of micron-sized particles prepared by a solid-state reaction.
机译：SrTiO_3：Pr〜（3 +），Al〜（3+）红色发光荧光粉颗粒是通过火焰喷雾热解直接制备的，无需进行任何后处理。系统研究了制备的SrTiO_3：Pr〜（3 +），Al〜（3+）颗粒的形貌，结晶度和光致发光（PL）。所制备的颗粒显示出良好的形态特征和高结晶度。颗粒的几何平均直径为0.53至0.70μm。颗粒在365 nm激发下从〜1D_2-〜3H_4跃迁在615 nm处显示亮红色发射。通过系统地控制气体流速，活化剂，添加剂和盐通量的浓度，对增强PL进行了优化。在Pr / Ti和Al / Ti摩尔比分别为0.001和0.03且LiNO_3通量为40 mol％的情况下，在615 nm处获得了最高的PL强度。在最佳合成条件下制备的亚微米级SrTiO_3：Pr〜（3 +），Al〜（3+）颗粒的光致发光强度高达固态反应制备的微米级颗粒的107％。

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