The luminescence properties of Er3+-doped and Er3+–Tm3+-co-doped phosphate glasses for white light emitting diode

Role of Al2O3 in upconversion and NIR emission in Tm3+ and Er3+ codoped calcium fluoro phosphorous silicate glass system

“…These changes may have strong bearing on various luminescence transitions and the energy transfer mechanism of rare earth ions in the glass network. The energy transfer mechanism between Er 3 þ and Tm 3 þ , and the process of upconversion have been reported earlier in a number of other glass systems [4,[18][19][20][21][22][23][24][25][26][27][28][29][30][31][32]. However, reports on the changes in the energy transfer mechanism between rare earth ions in the context of deviations in the coordination of rare earth ions (due to the variation in the concentrations of constituents of the glass matrix, especially, alumino phosphorous silicate glasses), to the best of our knowledge, are not available in the literature.…”

“…Band due to AlO 4 structural units is observed at about 820 cm À 1 [39][40][41]; in the same region the bands due to phosphate, silicate structural units are also present. Hence this band may be attributed to the common stretching vibrations of AlO 4 , PO 4 and SiO 4 structural units. The octahedral vibrational band due to AlO 6 structural units is observed at 500 cm À 1 [39][40][41].…”

“…Among various rare earth ions, Tm 3 þ , Er 3 þ ions are of great interest since they give rich emission in visible and near infrared (NIR) regions in the glass hosts [1][2][3][4]. Er 3 þ ions give out strong green and red emission while Tm 3 þ ions emit intense blue and weak red band lights.…”

Crystal structure refinement of new vanadates Ca8−xPbxCdBi(VO4)7

“…Crystal chemistry tuning of dielectric and optical properties in whitlockite-like phosphate and vanadate systems makes them attractive for scientists (Liang et al , 2010; Wu et al ., 2011; Zhang et al , 2011) because of isovalent and heterovalent substitutions (Lazoryak, 1996). Cations location in the host lattice has a direct impact on many properties of whitlockite-like compounds.…”

The structural role of manganese ions in some zinc phosphate glasses and glass ceramics

“…[1][2][3][4][5][6][7]. Because of these particular properties phosphate glasses are ideal materials for many applications such as laser hosts, glass-to-metal seals solid electrolytes and low frequency waveguides, photoconductors, nuclear waste immobilization matrices and as biomaterials [4,[8][9][10][11].…”