Fine yellow GdSr2AlO5:Ce3+ phosphor for white LEDs prepared by high energy ball milling process. Issue 3 (15th February 2016)

• Record Type: Journal Article
• Authors: Hong, Woo Tae; Yang, Hyun Kyoung; Jeong, Jung Hyun
• Is Part Of: Ceramics international. Volume 42:Issue 3(2016)
• Page Start: 4594
• Page End: 4599
• Publication Date: 2016-02-15
• Subjects: Phosphors -- GdSr2AlO5:Ce3+ -- Photoluminescence -- High-energy ball milling; Ceramics -- Periodicals; Céramique industrielle -- Périodiques; Ceramics; Periodicals; Electronic journals; 666
• DOI: 10.1016/j.ceramint.2015.11.157
• Languages: English
• ISSNs: 0272-8842

Abstract

Abstract: Gd1− x Sr2 AlO5 : x Ce 3+ (GSA:Ce 3+ ) yellow phosphors were prepared by a high-energy ball milling method. The X-ray diffraction pattern of GSA:Ce 3+ phosphors revealed a complex tetragonal structure corresponding to the GdSr2 AlO5 and GdSrAlO4 phases. The photoluminescence (PL) excitation spectra showed a dominant excitation wavelength at 438 nm due to the 4f–5d transition of Ce 3+ ions in the GSA host lattice. The photoluminescence (PL) spectra with 438 nm excitation displayed yellow emission corresponding to the 5d–4f transition of Ce 3+ ions. Doping a GdSr2 AlO5 host lattice with Ce 3+ ions at 2 mol% concentration or higher (corresponding to x =0.02 in the Gd1−x Sr2 AlO5 : x Ce 3+ formula) led to a quenching of the PL intensity. The emission peak of the resulting GSA:Ce 3+ phosphor shifted to the red region due to an increase in the crystal splitting for the Ce 3+ ions. A white light-emitting diode (WLED) fabricated by combining a blue 460 nm LED chip with the GSA:Ce 3+ phosphor exhibited the CIE chromaticity coordinates of (0.347, 0.311).