Preparation, luminescence and defect studies of Eu2+-activated strontium hexa-aluminate phosphor prepared via combustion method

✍ Scribed by Vijay Singh; T.K. Gundu Rao; Jun-Jie Zhu

• Publisher: Elsevier Science
• Year: 2006
• Tongue: English
• Weight: 396 KB
• Volume: 179
• Category: Article
• ISSN: 0022-4596
• DOI: 10.1016/j.jssc.2006.04.053

✦ Synopsis

Preparation of Eu 2+ ions activated strontium hexa-aluminate phosphor using the combustion method is described. An efficient phosphor can be prepared by this method at reaction temperatures as low as 500 1C in a few minutes. Powder X-ray diffraction (XRD), transmission electron microscopy, scanning electron microscope analysis were used to characterize the as prepared product and the optical properties were studied by photoluminescence (PL) spectra. Thermally stimulated luminescence studies also have been carried out on SrAl 12 O 19 :Eu 2+ phosphor. The TSL glow curve is broad and indicates two dominant peaks at 206 and 345 1C. Defect centres formed in irradiated phosphor have been studied using the technique of electron spin resonance. One of the centres is characterized by an isotropic g-value of 2.0055 and is assigned to a F + centre. The two annealing stages of F + centre in the region 125-230 and 340-390 1C appear to correlate with the release of carriers resulting in TSL peaks at 206 and 345 1C, respectively.