| Er3+:NaYF4nanostructured glass ceramic is a new optical functional material. This material is a novel composite material composed of glassy matrix and precipitated nano-crystals incorporated with active ions; it integrates the advantages of optical characteristics from nano-crystals and chemical properties from the oxide glass. It possesses desirable potential applications in some fields, such as optical communication, optical amplifier, upconversion devices and solar cell and so on. The optical properties, radiative properties, quantum cutting and dynamics of Er3+:NaYF4nanostructured glass ceramic have been studied in this paper.1. The effects of nanocrystalline on luminescent properties of Er3+:NaYF4transparent glass ceramic were studied. Base on Judd-Ofelt theory, the Judd-Ofelt intensity parameters were calculated in precursor glass and nanostructured glass-ceramic, respectively. By comparing and analyzing the change of intensity parameters, it is found that more Er3+ions had incorporated into NaYF4crystalline phase. The changes of crystal field and optical characteristics of Er3+had been studied. Using the decay curve, percentage of Er3+ions partitioned into NaYF4crystals was calculated.2. The infrared quantum cutting in Er3+:NaYF4nanostructured glass ceramics were studied. By characteristic energy level of Er3+, quantum cutting schematic diagram has been established. Base on excitation spectra and emission spectra, the presence of quantum cutting in Er3+:NaYF4nanostructured glass ceramic has been proved. Combining with the luminescence decay curves of the4S3/2â†'4I15/2emission, the quantum cutting efficiency were calculated.3. The dynamic process of quantum cutting in Er3+:NaYF4transparent glass ceramic were analyzed in theory. The radiative transition probability, non-radiative transition probability, cross relaxation probability and other spectral parameters were calculated. Base on rate equation theory, the fluorescent dynamic process of quantum cutting was discussed. The stationary states of rate equation were analyzed, and population of Er3+ions in the every energy level was proposed. The relations between the population distribution character and the relative concentration of Er3+ions were studied. |
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