๐”– Bobbio Scriptorium
โœฆ   LIBER   โœฆ

Photoluminescence property of vanadates M2V2O7 (M: Ba, Sr and Ca)

โœ Scribed by T. Nakajima; M. Isobe; T. Tsuchiya; Y. Ueda; T. Manabe

Publisher
Elsevier Science
Year
2010
Tongue
English
Weight
960 KB
Volume
32
Category
Article
ISSN
0925-3467

No coin nor oath required. For personal study only.

โœฆ Synopsis

We investigated the photoluminescent properties including the internal quantum efficiency (g) for the M 2 V 2 O 7 (M: Ba, Sr, and Ca) as a new vanadate phosphor system. In the M 2 V 2 O 7 , the broad band emission spectra from 400 to 800 nm derived from the charge transfer transition in the VO 4 tetrahedra were observed. The emission band of these compounds consisted of two maxima Em 1 and Em 2 corresponding to 3 T 1 -1 A 1 and 3 T 2 -1 A 1 transitions, respectively. These two maxima red-shifted with the decreasing ionic radius of M-site, as a result, the luminescent colour was varied from green (M: Ba) to yellowish orange (M: Ca). The g for the Ba 2 V 2 O 7 , Sr 2 V 2 O 7 and Ca 2 V 2 O 7 were 25%, 8% and 0.9%, respectively. This enhancement of g in the M 2 V 2 O 7 could be due to following structural features: the stronger V-V and weaker V-M correlations.

๐Ÿ“œ SIMILAR VOLUMES

Crystal growth and magnetic property of
Crystal growth and magnetic property of MCo2V2O8 (M=Sr and Ba)
โœ P. Lejay; E. Canevet; S.K. Srivastava; B. Grenier; M. Klanjsek; C. Berthier ๐Ÿ“‚ Article ๐Ÿ“… 2011 ๐Ÿ› Elsevier Science ๐ŸŒ English โš– 726 KB

We report, for the first time, the crystal growth of SrCo 2 V 2 O 8 and BaCo 2 V 2 O 8 compounds using floating zone technique in a mirror furnace under air. We have grown the single crystals of both compounds, with typical dimensions of 3 mm diameter and 5 cm long, which exhibit phase decomposition

Synthesis, Structure, and Physical Prope
Synthesis, Structure, and Physical Properties of La3-xMxNi2O7-ฮด (M = Ca2+, Sr2+, Ba2+; 0 < x โ‰ค 0.075)
โœ Z. Zhang; M. Greenblatt ๐Ÿ“‚ Article ๐Ÿ“… 1994 ๐Ÿ› Elsevier Science ๐ŸŒ English โš– 291 KB

The synthesis, structure, and physical properties of \(\mathrm{La}_{3-x}\) \(M_{x} \mathrm{Ni}_{2} \mathrm{O}_{7-\delta}\), with \(M=\mathrm{Ca}^{2+}, \mathrm{Sr}^{2+}\), or \(\mathrm{Ba}^{2+}\), and \(0<x \leq 0.075\), were investigated. These compounds were prepared by a precursor method with tetr