Luminescence Properties of a Yellow GdSr

Luminescence Properties of a Yellow GdSr

AlO

:Ce

Phosphor for a White LED

Woo Tae Hong · Hyun Kyoung Yang

Department of LED Convergence Engineering, Pukyong National University, Busan 48547, Korea (Received 17 August 2015 : revised 6 October 2015 : accepted 6 October 2015)

GdSr2AlO5:Ce³⁺ phosphors were synthesized by using a high-energy ball-milling method. The crystal structure, surface morphology and luminescence properties of the GdSr2AlO5:Ce³⁺ phos- phors were measured in terms of the sintering temperature. The crystal structure and the crystal phase of the GdSr2AlO5:Ce³⁺phosphors were analyzed by using X-ray diffraction. The particle size of the GdSr2AlO5:Ce³⁺phosphor was found to increase with increasing sintering temperature. For the phosphor sintered at 1600^◦C, the luminescence properties were due to the f-d transition in the Ce³⁺ion while the phosphors sintered at temperatures less than 1500^◦C exhibit the luminescence properties of the Ce⁴⁺ ion. The phosphor sintered at 1600 ^◦C was excited at 439 nm, and its excitation spectrum exhibited an excitation region at wavelengths from 375 nm to 500 nm, with the maximum excitation intensity occurring at 439 nm. Also, the photoluminescence spectrum of the phosphor sintered at 1600^◦C showed a yellow luminescence region at wavelengths from 500 nm to 800 nm, with the maximum intensity occurring at 576 nm. These results from the GdSr2AlO5:Ce³⁺

phosphor can be used with blue light-emitting diodes (LEDs) to implement warm white LEDs.

PACS numbers: 78.20.-e, 78.55.-m

Keywords: GdSr2AlO5:Ce³⁺, White LED, Phosphor

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This is an Open Access article distributed under the terms of the Creative Commons Attribution Non-Commercial License (http://creativecommons.org/licenses/by-nc/3.0) which permits unrestricted non-commercial use, distribution, and reproduction in any medium, provided the original work is properly cited.

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Fig. 6. (Color online) CIE 1931 color coordinate of GdSr₂AlO₅:Ce³⁺ phosphors sintered at 1600 ^◦C.

The inset of figure 6 shows the photographs of yellow light emission from the combination of blue LED and GdSr2AlO5:Ce³⁺ phosphor sintered at 1600^◦C.

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