Abstract
A novel method of codoping the Er3+, Yb3+, and Ho3+ions in tellurite glasses is demonstrated to obtain a high efficiency ofinfrared-to-visible upconversion. Three intense emission bands observedin Er3+, Yb3+, and Ho3+ codoped tellurite glassescentred at 525, 547, and 657 nm correspond to Er3+: 2H11/2→4I15/2, Er3+: 4S3/2→4I15/2+Ho3+: 5S2(5F4)→5I8, andEr3+: 4S3/2→4I15/2+Ho3+: 5F5→5I8 transitions, respectively. No visible upconversion quenchingphenomenon is observed when three rare-earth ions are codoped togetherin tellurite glasses. In contrast, the upconversion intensity ofred and green emissions in Er3+, Yb3+, and Ho3+codoped glasses is enhanced largely when compared withEr3+/Yb3+-codoped glasses. The dependence of upconversionintensities on excitation power and the possible upconversionmechanisms are evaluated. The three emissions are based ontwo-photon absorption processes.
Published Version
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