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Quantitative analysis of erbium luminescence in LiYF4 doped with low (1.41 %) and high (3 8.5 %) Er+3 concentrations

1995; Elsevier BV; Volume: 4; Issue: 5 Linguagem: Inglês

10.1016/0925-3467(95)80009-3

1873-1252

Marly B. Camargo, L. Gomes, S.P. Morato,

Glass properties and applications

The luminescent-channel efficiency for Er+3 ions in LiYF4: Er+3 (38.5%) crystal was measured and compared with the case of Er+3 as a low-concentration dopant (1.41 %) in crystals of LiYF4. The 4S3/2 → 4I13/2, 4I15/2 luminescent transitions are strongly quenched in the high concentrated system, by two possible cross-relaxation processes involving one phonon absorption, favoring the population of the 4I11/2 and 4I13/2 levels. A strong quenching of the total Er+3 luminescence by approximately 6.8 times was observed in the highly doped system at 300 K. The two middle infrared (mid-IR) 4I11/2 → 4I13/2 and 4I13/2 → 4I15/2 luminescent transitions were quenched by an attributed energy transfer from the Er3+ excited 4I11/2 and 4I13/2 levels to Me+ +(OH−)2 and HCO− molecules that are present in the host material as impurities.