A New High-Efficiency UV-Emitting X-Ray Phosphor, BaHf1−xZrx(PO4)2

✍ Scribed by C.R. Miao; C.C. Torardi

• Book ID: 102608700
• Publisher: Elsevier Science
• Year: 2000
• Tongue: English
• Weight: 198 KB
• Volume: 155
• Category: Article
• ISSN: 0022-4596
• DOI: 10.1006/jssc.2000.8938

✦ Synopsis

Barium hafnium+zirconium phosphate BaHf 1؊x Zr x (PO 4 ) 2 (x ‫؍‬ 0+0.2), having the monoclinic KFe(SO 4 ) 2 (Yavapaiite) structure, is a broad-band UV-emitting phosphor. At room temperature, it has an emission peak maximum at approximately 356 nm under 30 kV peak molybdenum X-ray excitation. Compositions derived from 99% pure hafnia and having nominal values of x&0.01+0.05 demonstrate luminescence e7ciencies that make BaHf 1؊x Zr x (PO 4 ) 2 30% brighter than CaWO 4 Hi-Plus. This e7ciency is equal to that of a commercial M }YTaO 4 phosphor that emits at 330 nm. BaHf 1؊x Zr x (PO 4 ) 2 is, thus, a potentially attractive candidate for use in medical diagnostic imaging systems. The lower X-ray absorption of BaHf 1؊x Zr x (PO 4 ) 2 , relative to that of UV-emitting M+YTaO 4 , suggests that the title phosphor may be suitable for two-sided mammography screen applications. The synthesis conditions, X-ray excited luminescence, and e4ects of Eu, Sn, and Ti doping are discussed.