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Efficient cerium-based sol–gel derived phosphors in different garnet matrices for light-emitting diodes

Authors
Journal
Journal of Alloys and Compounds
0925-8388
Publisher
Elsevier
Publication Date
Volume
509
Issue
21
Identifiers
DOI: 10.1016/j.jallcom.2011.03.032
Keywords
  • Phosphors
  • Sol–Gel Processes
  • Optical Properties
  • Luminescence
Disciplines
  • Physics

Abstract

Abstract Efficiency of sol–gel derived Y 3− x Al 5O 12:Ce x 3+ (YAG:Ce) and Y 3− x Mg 2AlSi 2O 12:Ce x 3+ (YMASG:Ce) phosphors, which are prospective for application in white light emitting diodes (LED), is studied. Sets of samples containing different cerium amount x from 0.015 to 0.06 and sintered at different temperatures (1400–1550 °C) were investigated. Importance of absorption peculiarities in agglomerates of phosphor nanocrystals is demonstrated by studying the excitation wavelength dependence of quantum efficiency and by applying PL measurements in confocal mode. Emission saturation is demonstrated to occur at higher excitation intensities than those typical for operating white LEDs.

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