Generation of white-light from Dy³⁺ doped Sr₂SiO₄ phosphor

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• 作者：M.A. Tshabalala^a ; F.B. Dejene^b ; Shreyas S. Pitale^a ; H.C. Swart^a ; O.M. Ntwaeaborwa^a ; ^{ntwaeab@ufs.ac.za" class="auth_mail} ; ^{ntwaeab@gmail.com" class="auth_mail}
• 关键词：Sr2SiO4 ; Dy3+ ; White light ; LED ; XPS
• 刊名：Physica B
• 出版年：15 April, 2014
• 年：2014
• 卷：439
• 期：Complete
• 页码：126-129
• 全文大小：1303 K

文摘

A single host lattice white light emitting Sr₂SiO₄:Dy³⁺ powder phosphor was synthesized by solid state reaction process using a temperature of 1000 掳C. The structure, particle morphology, chemical composition and oxidation states, photoluminescence (PL) and decay properties of the phosphor were analyzed using X-ray diffraction (XRD), scanning electron microscopy (SEM), X-ray photoelectron spectroscopy and PL spectroscopy, respectively. The objective of this study was to prepare a phosphor that can be used in white light emitting diodes. The XRD patterns showed a monoclinic structure of Sr₂SiO₄ with minor incidental secondary phases from unreacted precursors. An agglomeration of particles with irregular shapes was observed from the SEM micrographs. The PL emission spectra of the Sr₂SiO₄:Dy³⁺ phosphor excited at 350 nm consist of blue, yellow and red line emissions at 486 nm, 575 nm and 668 nm corresponding respectively to the (⁴F_9/2鈫?sup>6H_15/2), (⁴F_9/2鈫?sup>6H_13/2) and (⁴F_9/2鈫?sup>6H_11/2) transitions of Dy³⁺. The combination of these emissions constituted white light as indicated on the Commission Internationale de L'Eclairage chromatic coordinate diagram. The decay characteristics show that the phosphor consists of a single exponential decay process.