Enhanced NIR emission in Ce3+/Er3+-doped YAG induced by Bi3+ doping

Abstract

Ce 3+ /Er 3+ /Bi 3+ triply-doped yttrium aluminum garnet (YAG) is synthesized using co-precipitation method. The Bi 3+ concentration-dependent near-infrared (NIR) emission behavior is systemically investigated. The NIR emission of Er 3+ ions at 1531 nm is enhanced threefold by the addition of 7 mol% Bi 3+ . Bi 3+ doping results in the formation of exciton in YAG and the variation in the local environment of the doped rare-earth ions. The enhancement in NIR luminescence is ascribed to the combined effects of the sensitization of exciton→Ce 3+ →Er 3+ and the Bi 3+ doping-induced adjustment of the local environment for Ce 3+ and Er 3+ ions.

Broadband shifting luminescence in Cr3+/Yb3+ codoped Y3Al5O12 thin films by pulsed laser deposition

“…The theoretical limit for the conversion efficiency can be increased from 30% to 39% by applying an ideal down-converting layer on top of Si solar cells [1] . Various trivalent RE ions are possible, such as Pr 3þ , Ho 3þ , Er 3þ , Tb 3þ , and Tm 3þ with f-f transition [1][2][3][4][5][6][7][8][9] . In order to make better use of sunlight, RE ions with f-d transition, such as Ce 3þ , Eu 2þ , and Yb 2þ [10][11][12] ; metal ions, such as Cr 3þ and Bi 3þ [13][14][15] ; the host [16] were chosen as the energy donors for Yb 3þ to realize the broadband spectral conversion.…”