Electronic structure and optical properties of Ti-doped phosphate crystals

✍ Scribed by Y. Hizhnyi; A. Oliynyk; O. Gomenyuk; S. Nedilko; P. Nagornyi; R. Boiko; V. Boyko

• Publisher: Elsevier Science
• Year: 2007
• Tongue: English
• Weight: 167 KB
• Volume: 144
• Category: Article
• ISSN: 0921-5107
• DOI: 10.1016/j.mseb.2007.07.099

✦ Synopsis

Luminescence properties of NaAl 1-x Ti x P 2 O 7 (x = 0-1) double phosphates under VUV excitation are studied. Partial densities of electronic states are calculated for perfect NaAlP 2 O 7 , NaTiP 2 O 7 and Ti-doped NaAlP 2 O 7 crystals. Pure NaAlP 2 O 7 crystals exhibit emission bands peaking near 300 and 770 nm. Doping of NaAlP 2 O 7 crystals with Ti ions leads to appearance of emission bands in blue-green spectral region with main peak near 500 nm. NaTiP 2 O 7 exhibit emission in blue-green region with similar shape as for NaAlP 2 O 7 :Ti. The luminescence mechanisms in Ti-doped phosphates are discussed using both experimental and theoretical results. Observed emission bands in blue-green region of spectrum are ascribed to emission centers like Ti 4+ + F-centers.