Influence of Li⁺ codoping on visible emission of Y₂O₃:Tb³⁺, Yb³⁺ phosphor

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• 作者：Anurag P ; ey ; Vineet Kumar Rai ; Kaushal Kumar
• 关键词：Upconversion phosphor ; Combustion synthesis ; Cooperative transfer ; Terbium ; CIE coordinates
• 刊名：Spectrochimica Acta Part A: Molecular and Biomolecular Spectroscopy
• 出版年：24 January, 2014
• 年：2014
• 卷：118
• 期：Complete
• 页码：619-623
• 全文大小：1461 K

文摘

Upon 980 nm diode laser excitation visible upconversion emission from the Tb³⁺ ions has been observed in combustion synthesized Tb³⁺-Yb³⁺ codoped Y₂O₃ phosphor. The intensity of upconversion as well as downconversion emission bands has been increased by codoping of Li⁺ ions into Tb³⁺-Yb³⁺:Y₂O₃ phosphor and the reason behind this increment is discussed. The pump power dependence of upconversion emission bands has shown two-photon absorption process. The cooperative energy transfer from Yb³⁺ to Tb³⁺ ions is supposed to be responsible for the upconversion emission from the Tb³⁺ ions on near infrared excitation. The calculated colour coordinates indicate the purity of intense green emission from present phosphor which is suitable for various photonic applications.