Electronic Structures and Luminescence Properties of YNbO4 and YNbO4:Bi

✍ Scribed by Seung Kwon Lee; Hyunju Chang; Cheong-Hwa Han; Hyun-Jung Kim; Ho G. Jang; Hee Dong Park

• Publisher: Elsevier Science
• Year: 2001
• Tongue: English
• Weight: 245 KB
• Volume: 156
• Category: Article
• ISSN: 0022-4596
• DOI: 10.1006/jssc.2000.8941

✦ Synopsis

The luminescence properties of fergusonite phosphors, YNbO 4 and YNbO 4 :Bi, were investigated with photoluminescence (PL) measurements and 5rst-principles calculations. The various absorption spectra of these phosphors have been interpreted using the calculated partial density of states in the framework of density functional theory. We were able to determine the chargetransfer gap of YNbO 4 , 4.3 eV, that agrees well with our experimental measurement. From our analysis of PL spectra and calculations, we have investigated the Bi e4ect in YNbO 4 :Bi, which shows an excitation peak at a longer wavelength than YNbO 4 . We have found that the charge transfer from oxygen to bismuth is the main reason for the peak position shift in the excitation spectra. 2001 Academic Press