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Concentration dependence of the quantum yield of luminescence of Tm3+ ions in gadolinium oxychloride

“…For example, at λ rec = 1855 nm (transition 3 F 4 → 3 H 6 ) the intensity of the bands in the shortwave region of the IR luminescence excitation spectrum increases. As was noted in [6], at λ rec = 1185 nm (transition 3 H 5 → 3 H 6 ) only the low-intensity band ,463 nm (level 1 G 4 ) appears in the luminescence excitation spectrum of GdOCl:Tm 3+ as a result of the cross-relaxation population of the 3 H 5 level through the ( 1 G…”

“…For such materials, of particular importance are processes of energy transfer between rare-earth ions, in particular, the cross-relaxation processes whose rates depend on the concentration of the activator ions. In earlier works, we have shown that the concentration and temperature dependences of the luminescence intensity of Tm 3+ ions in oxide [5] and oxychloride [6] matrices are mainly determined by the cross-relaxation of these ions. The effects of quenching and "rise" of luminescence of Er 3+ and Ho 3+ ions in an oxychloride matrix, caused by the cross-relaxation multiplication of their states under IR radiation, with a quantum yield of luminescence exceeding the unity by 2-3 times, have been investigated in [5][6][7][8][9].…”

“…In earlier works, we have shown that the concentration and temperature dependences of the luminescence intensity of Tm 3+ ions in oxide [5] and oxychloride [6] matrices are mainly determined by the cross-relaxation of these ions. The effects of quenching and "rise" of luminescence of Er 3+ and Ho 3+ ions in an oxychloride matrix, caused by the cross-relaxation multiplication of their states under IR radiation, with a quantum yield of luminescence exceeding the unity by 2-3 times, have been investigated in [5][6][7][8][9]. It has been shown that the concentration dependences of the quantum yield of Er 3+ and Ho 3+ luminescence are adequately described within the limits of the model of pair, cross-relaxation interactions.…”

“…In the present work, we have performed investigations of the absorption, luminescence, and luminescence excitation spectra of GdOCl:Tm 3+ with an activator concentration of 0-100 mole % (eight samples), which are necessary for measurement and calculation of the quantum yield of luminescence of a luminophor. The luminophors was synthesized by the method used in [5][6][7][8][9][10]. The spectra were recorded in the range 250-2500 nm with the use of a high-resolution spectral apparatus (a CARY-500 spectrophotometer and an automated, spectral measurement complex based on an SDL-2 device) providing a means for measuring, if necessary, the detailed structure of the Stark splitting of absorption, luminescence, and luminescence excitation bands.…”

“…1c was recorded with a high spectral resolution). As the concentration of the Tm 3+ ions increases, the luminescence excitation spectra undergo changes indicative of the crossrelaxation population of the luminescence levels [5,6]: the ratio between the intensities of the bands changes depending on the luminescence wavelength recorded. For example, at λ rec = 1855 nm (transition 3 F 4 → 3 H 6 ) the intensity of the bands in the shortwave region of the IR luminescence excitation spectrum increases.…”