Synthesis And Luminescence Properties Of Ce3+-Doped Y3Al3.5Ga1.5O12 Green Phosphor For White Leds

Keywords

Luminescence; Phosphors; Thermal stability; White LEDs; YAGG:Ce

Abstract

A series of Ce3+-doped Y3Al3.5Ga1.5O12 green phosphors were successfully synthesized by a solid-state reaction method. The microstructure, morphology, luminescence spectra, luminescence quantum yield (QY) and thermal stability of the phosphor were investigated. The critical concentration of Ce3+ ions in Y3-mAl3.5Ga1.5O12:mCe3+ is m=0.06. The QY of Y2.94Al3.5Ga1.5O12:0.06Ce3+ phosphor is as high as 94% under excitation at 450 nm and its luminescence intensity at 150 °C still maintains 90% of that measured at 25 °C, which are just a little worse than those of commercial Lu3Al5O12:Ce3+ green phosphor but much better than those of commercial (Sr,Ba)2SiO4:Eu2+ green phosphor. A white LED lamp was fabricated by employing Y2.94Al3.5Ga1.5O12:0.06Ce3+ as a green phosphor and commercial (Ca,Sr)AlSiN3:Eu2+ as a red phosphor (628 nm), its Ra value, correlated color temperature (CCT), CIE1931 chromaticity coordinates and luminous efficiency is 84, 3081 K, (x=0.4369, y=0.4142) and 102 lm/W, respectively. The experimental results demonstrate that Y2.94Al3.5Ga1.5O12:0.06Ce3+ is a promising green phosphor not only can be used for high color rendering index white LEDs but also for high-power white LEDs.

Publication Date

4-1-2016

Publication Title

Journal of Luminescence

Volume

172

Number of Pages

105-110

Document Type

Article

Personal Identifier

scopus

DOI Link

https://doi.org/10.1016/j.jlumin.2015.11.041

Socpus ID

84950118359 (Scopus)

Source API URL

https://api.elsevier.com/content/abstract/scopus_id/84950118359

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