Thermal stability of the luminescence of Ca6Ba(PO4)4O:Eu2+ yellow phosphor for white light-emitting diodes

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• 作者：Yingjun Meng ; Weiren Zhao ; Junhua Chen ; Nenghuo Wang ; Yiyang Zhou…
• 刊名：Applied Physics A: Materials Science & Processing
• 出版年：2016
• 出版时间：July 2016
• 年：2016
• 卷：122
• 期：7
• 全文大小：1,310 KB
• 刊物类别：Physics and Astronomy
• 刊物主题：Physics
  Condensed Matter
  Optical and Electronic Materials
  Nanotechnology
  Characterization and Evaluation Materials
  Surfaces and Interfaces and Thin Films
  Operating Procedures and Materials Treatment
  
• 出版者：Springer Berlin / Heidelberg
• ISSN：1432-0630
• 卷排序：122

文摘

Yellow-emitting Ca₆Ba(PO₄)₄O:Eu2+ phosphors were synthesized by solid-state reaction method. The phase composition was checked by X-ray powder diffraction. The photoluminescence properties of Ca₆Ba(PO₄)₄O:Eu2+ and their thermal properties of photoluminescence were explored. The excitation spectra ranging from 230 to 450 nm and an intense broad yellow emission band centered at 530 nm can be observed under the excitation at 375 nm. Ca₆Ba(PO₄)₄O:0.07Eu2+ phosphor maintains 45 % of the photoluminescence intensity of room temperature when heated up to 150 °C, exhibiting a relatively good thermal quenching resistance. The optimum concentration of Eu2+ in Ca_6−xBa(PO₄)₄O:xEu2+ was found with x = 0.07, and the concentration quenching mechanism was illustrated by configurational coordinate diagram. The luminescence decay of Eu2+ ions was also studied carefully, showing the decrease of the lifetime with the increase of Eu2+ concentration.