Surface characterization and luminescent properties of SrAl₂O₄:Eu²⁺, Dy³⁺ nano thin films

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• 作者：H.C. Swart ; ^{swarthc@ufs.ac.za} ; O.M. Ntwaeaborwa ; P.D. Nsimama ; J.J. Terblans
• 关键词：SrAl2O4 ; Eu2+ ; Dy3+ ; Phosphor thin films ; PLD ; Photoluminescence ; Diffusion
• 刊名：Physica B
• 出版年：2012
• 期刊代码：53_09214526
• 类别：ph
• 出版时间：15 May, 2012
• 卷：407
• 期：10
• 页码：1660-1663
• 文件大小：628 K

摘要

SrAl₂O₄:Eu²⁺, Dy³⁺ thin films were grown on Si (1 0 0) substrates in different atmospheres using the pulsed laser deposition (PLD) technique. The effects of vacuum, oxygen (O₂) and argon (Ar) deposition atmospheres on the structural, morphological and photoluminescence (PL) properties of the films were investigated. The films were ablated using a 248 nm KrF excimer laser. Improved PL intensities were obtained from the unannealed films prepared in Ar and O₂ atmospheres compared to those prepared in vacuum. A stable green emission peak at 520 nm, attributed to 4f⁶5d¹鈫?f⁷ Eu²⁺ transitions was obtained. After annealing the films prepared in vacuum at 800 掳C for 2 h, the intensity of the green emission (520 nm) of the thin film increased considerably. The amorphous thin film was crystalline after the annealing process. The diffusion of adventitious C into the nanostructured layers deposited in the Ar and O₂ atmospheres was most probably responsible for the quenching of the PL intensity after annealing.