Enhancement of characteristic red emission from SrTiO3:Pr3+ by Al addition
Enhancement of characteristic red emission from SrTiO3:Pr3+ by Al addition
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DOI：
10.1063/1.371565
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发表时间：
1999-11-15
影响因子：
3.2
通讯作者：
Yamamoto, H
中科院分区：
文献类型：
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作者：
Okamoto, S;Kobayashi, H;Yamamoto, H
研究了Al对SrTiO3:Pr3+ (D-1(2)—>H-3(4) Pr3+发射效率的增强机理。以23mol % Al合成的SrTiO3:Pr3+荧光粉在室温下的发射强度比无Al样品高约200倍。低温光致发光（PL）光谱显示了随着Al摩尔比的增加，D-1(2)—>H-3(4)跃迁的几个红色发射线的进展。这些线可能是由于al相关Pr3+中心的形成。al缔合的Pr3+ PL在室温下不表现出热猝灭。100k以下的PL光谱和激发光谱表明，SrTiO3主体中的光激发载流子向PL中心发生了能量转移。PL强度、x射线衍射测量和高分辨率透射电镜图像表明，Al的加入改善了SrTiO3:Pr3+的结晶度，导致缺陷减少，可能增加了向辐射中心的能量传递。这些结果表明，al相关Pr3+发光中心的增加和结晶度的提高导致了D-1(2)—>H-3(4)发射的增强。(C) 1999年美国物理研究所。[s0021 - 8979(99) 02822 - 4]。
The mechanism of enhancement on the red emission efficiency from SrTiO3:Pr3+ (D-1(2)-->H-3(4) emission of Pr3+) by Al addition has been investigated. The emission intensity at room temperature for the phosphor, SrTiO3:Pr3+ synthesized with 23 mol % Al is about 200 times higher than Al-free samples. Photoluminescence (PL) spectra at low temperatures show the progress of several red emission lines of the D-1(2)-->H-3(4) transition with an increase in Al molar ratio. The lines are probably due to formation of Al-associated Pr3+ centers. The Al-associated Pr3+ PL does not exhibit thermal quenching up to room temperature. Temperature dependent PL spectra below 100 K and PL excitation spectra reveal that the energy transfer occurs from photoexcited carriers in SrTiO3 host to PL centers. The PL intensity, x-ray diffraction measurements, and high-resolution transmission electron microscope images indicate the improvement of crystallinity of SrTiO3:Pr3+ with Al addition, resulting in a decrease in defects and probably an increase in the energy transfer to radiative centers. These observations imply that both the increase of the Al-associated Pr3+ luminescence centers and the improvement of the crystallinity result in the enhancement of the D-1(2)-->H-3(4) emission. (C) 1999 American Institute of Physics. [S0021-8979(99)02822-4].