Energy transfer in Er:Eu:Yb co-doped tellurite glasses: Yb as enhancer and quencher

Three primary colors emitting from Er3+–Eu3+ co-doped oxygen-deficient glasses

“…1. In accordance with energy level diagram and literature data [24,25], the observed absorption bands Just like what we envisaged, the GODCs, Er and Eu co-doped glass shows multi-color emissions when excited by different UV light. Fig.…”

“…Similar energy transfer process was reported by Dwivedi et al [25]. The detailed mechanism could refer to Ref [25]. The decay curves for the emission transition of 5 D 0 → 7 F 2 of Eu 3+ ions are also shown in Fig.…”

“…The inset reveals three primary colors (blue, green, red) emission when the glass excited by 340, 379, and 395 nm UV lights, respectively. When this glass excited by 379 nm UV light, green emission bands were detected at 526 and 550 nm which can be ascribed to typical 2 H 11/2 → 4 I 15/2 , 4 S 3/2 → 4 I 15/2 transitions of Er 3+ ions [24,25]. And when excited by 395 nm UV light, red emission bands were detected at 580, 590 and 615 nm which were due to typical 5 D 0 → 7 F 0 , 5 D 0 → 7 F 1 , 5 D 0 → 7 F 2 transitions of Eu 3+ ions [24,25].…”

Transparent glass–ceramics with (Eu3+,Yb3+):YNbO4 nanocrystals: Crystallization, structure, optical spectroscopy and cooperative upconversion

“…Phosphors based on Y 2 O 3 [38,39], Y 3 Al 5 O 12 and Gd 3 Ga 5 O 12 [40], Li 2 Lu 5 O 4 (BO 3 ) 3 [41] and BaB 4 O 7 [42] nano-powders codoped with Eu 3+ and Yb 3+ were previously studied, as well as Eu:KYb(WO 4 ) 2 single crystal [43]. Also, (Eu 3+ , Yb 3+ ) codoped oxyfluoroborate [44], oxyfluoride [45,46], sol-gel silica [47] and fluorotellurite [48] glasses are known. Transparent nanophase GCs could be a good alternative to glasses, single crystals and nano-powders due to a simple method of their synthesis based on conventional glass technology, i.e.…”

Spectroscopic study of Sm:Ce ions co-doped in barium fluoroborate glass

“…The concentrations of both the Ln species have been optimized with the emission intensity and it was found that the concentration quenching effect is observed beyond 0.15 mol% (Sm 3+ ) and 0.05 mol% (Ce 3+ ). Concentration quenching is presumed to be due to energy migration to the impurities or defects [18,19]. Sm:Ce codoped sample shows a different emission characteristics [ Fig.…”