Luminescence properties of novel deep-red-emitting Ca₃Al₂Ge₂O₁₀:Cr³⁺ phosphors

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• 作者：Qiongyu Bai ; Zhijun Wang ; Panlai Li ; Ting Li ; Shuchao Xu and Zhiping Yang
• 刊名：Luminescence
• 出版年：2016
• 出版时间：September 2016
• 年：2016
• 卷：31
• 期：6
• 页码：1277-1282
• 全文大小：473K
• ISSN：1522-7243

文摘

Ca₃Al₂Ge₂O₁₀:Cr³⁺ phosphors were prepared by a high-temperature solid-state method, and their luminescence properties were investigated. Under excitation at 550 nm, Ca₃Al₂Ge₂O₁₀:Cr³⁺ phosphors exhibited a broad red emission band at 697 nm in the range 650–750 nm that was caused by the ²E→⁴A₂ transition of Cr³⁺. For the 697 nm emission peak, emission intensity reached a maximum at x = 0.07, and there was concentration quenching of Cr³⁺ in Ca₃Al₂Ge₂O₁₀; the corresponding concentration quenching mechanism was analysed. Under excitation at 262 nm, the Ca₃Al₂Ge₂O₁₀:Cr³⁺ phosphor showed a weakly broad emission band in the range 350–600 nm that was caused by intrinsic defects (V′′_Ca and V′′_O). Copyright