Abstract
Na0.4Y0.6F2.2:Er3+ (NYF:Er3+) crystals with an Er concentration up to 15% were grown by the Bridgman-Stockbarger method. The luminescence kinetics was investigated for a series of NYF:Er3+ crystals (0.5–15% Er), as well as the concentration and temperature quenching of the luminescence from radiative Er levels upon selective laser excitation. It is shown that the luminescence from the 4S3/2 level is quenched significantly with increasing temperature and concentration. The luminescence from the 4G11/2, 2G(H)9/2, 4F9/2, and 4I9/2 levels is quenched mainly due to nonradiative multiphonon transitions. The concentration quenching of the luminescence from the 4I11/2 and 4I13/2 levels was not observed. Possible schemes of the self-quenching of excited levels of erbium are considered and the microparameters and macrorates of self-quenching are estimated by model quantum-mechanical calculation. Based on the comparison of the calculated and experimental self-quenching rates, the most probable mechanisms and schemes of self-quenching are determined. The self-quenching of the 4S3/2 level of erbium was investigated experimentally and theoretically. Good agreement is obtained between the experimental and the calculated kinetic curves and the dependences of the self-quenching rates on Er concentration. It is concluded that NYF:Er3+ crystals are promising as active media for tunable lasers with laser diode pumping.
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