Abstract Persistent phosphor Gd3Al2Ga3O12:Ce3+-Cr3+ (GAGG:Ce3+-Cr3+) has been synthesized by solution combustion synthesis (SCS) incorporating mixed organic fuels of glycine and urea at 773 K. Using only single fuel can lead to incomplete combustion and amorphous products. Without additional heat treatment, a porous and pulverized GAGG:Ce3+-Cr3+ powders can be obtained when the fuel ratio ϕ = 1. The products exhibited yellow color emission in visible light photoluminescence. This emission is originated from Ce3+. Photoluminescence excitation spectra indicated that GAGG:Ce3+-Cr3+ can be well excited by blue light, marking its potential for white LED lights application. In comparison with green luminescence Y3Al2Ga3O12 doped with Ce3+-Cr3+ (YAGG:Ce3+-Cr3+), the yellow color in GAGG:Ce3+-Cr3+ is due to crystal field splitting when Y is substituted by Gd. Also, electron energy-loss spectroscopy measurement using scanning electron microscopy (STEM-EELS) showed that the band gap decreased in 6.14 eV, 6.05 eV and 5.93 eV order when Ga content (x = 2.5, 3, 3.5) increased. The bandgap change showed that the trap level produced by Cr3+ ions affected the persistent luminescence. In this study, when Ga content x = 3, Gd3Al5-xGaxO12:Ce3+-Cr3+ exhibited the longest persistent luminescence.

中文翻译：

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混合燃料溶液燃烧合成黄色持久磷石榴石及其特性

摘要 持久性荧光粉 Gd3Al2Ga3O12:Ce3+-Cr3+ (GAGG:Ce3+-Cr3+) 已通过溶液燃烧合成 (SCS) 在 773 K 下结合甘氨酸和尿素的混合有机燃料合成。仅使用单一燃料会导致不完全燃烧和无定形产物。当燃料比φ = 1 时，无需额外的热处理，即可获得多孔粉碎的 GAGG:Ce3+-Cr3+ 粉末。产物在可见光光致发光中呈黄色发射。这种发射源自 Ce3+。光致发光激发光谱表明 GAGG:Ce3+-Cr3+ 可以很好地被蓝光激发，标志着其在白光 LED 灯应用中的潜力。与掺杂Ce3+-Cr3+（YAGG:Ce3+-Cr3+）的绿色发光Y3Al2Ga3O12相比，GAGG中的黄色：Ce3+-Cr3+ 是由于 Y 被 Gd 取代时的晶体场分裂。此外，使用扫描电子显微镜 (STEM-EELS) 进行的电子能量损失光谱测量表明，当 Ga 含量 (x = 2.5, 3, 3.5) 增加时，带隙以 6.14 eV、6.05 eV 和 5.93 eV 的顺序减小。带隙变化表明Cr3+离子产生的陷阱能级影响了持续发光。在本研究中，当 Ga 含量 x = 3 时，Gd3Al5-xGaxO12:Ce3+-Cr3+ 表现出最长的持续发光。