Energy transfer between Cr3+ and Ni2+ in transparent glass ceramics containing β-Ga2O3 nanocrystals

Abstract

In this paper, we report on spectroscopic studies of Cr 3+ / Ni 2+ codoped transparent glass ceramics containing ␤-Ga 2 O 3 nanocrystals. Energy transfer between Cr 3+ and Ni 2+ in the Cr 3+ / Ni 2+ codoped glass ceramics has been investigated by steady state emission spectra, time-resolved emission spectra, and excitation spectra. The nonradiative energy transfer has been confirmed from the decrease in the Cr 3+ fluorescence lifetime after Ni 2+ codoping. The energy transfer efficiency is estimated and the energy transfer mechanism is discussed.

Energy‐Transfer Modulation for Enhanced Photocatalytic Activity of Near‐Infrared Upconversion Photocatalyst

“…Therefore, for improving the ET efficiency, nonradiative energy‐transfer (NRET) approach was taken alternatively. The mechanism underlying the NRET approach is illustrated as a nonradiative dipole–dipole interaction between donors and acceptors with similar vibrating frequency . Without entering into the light propagation management, NRET can prevent the unexpected energy‐loss in RET and provide a relatively high ET efficiency (>50%, even ~80%) .…”

Pre-crystallization heat treatment and infrared luminescence enhancement in Ni2+-doped transparent glass-ceramics

“…Nevertheless, most studies on the effects of heat treatments on the structure and properties of multi-component glass-ceramics are aimed at the investigation of phase transformation during glass crystallization, revealing structure and property changes just at the crystallization range. In particular, only one-step isothermal treatment is used for Ni 2+ -doped low-alkali gallium silicate glasses to fabricate glass-ceramics [2][3][4][5][6][7][8][9][10][11][12][13][14][15][16][17][18][19], with the exception of one paper where two-step heat treatment [20] was applied for few glass compositions but without any investigation of luminescence efficiency as a function of such treatment. Moreover, the effect of heat treatment conditions on the luminescence efficiency (quantum yield or integrated intensity of the luminescence band), which is one of the target characteristics of the final material, has received no attention in previous papers on Ni 2+ -doped low-alkali gallium silicate glasses [2][3][4][5][6][7][8][9][10][11][12][13][14][15][16][17][18][19][20].…”