Size Effect in Novel Red Efficient Garnet Nanophosphor
2017
Głuchowski, Paweł | Małecka, Małgorzata | Stręk, W. | Ryba-Romanowski, Witold | Solarz, Piotr
Nanocrystalline powders of Eu³⁺ doped Gd₃Ga₃Al₂O₁₂ (GGAG) were prepared using a modified Pechini method. The nanocrystals with the size from tens to hundreds of nanometers were obtained. For growth of single crystal GGAG:Eu the Czochralski method was utilized. The crystal structure, grain morphology, and optical properties of GGAG doped with different concentration of Eu³⁺ and calcined at different temperatures were investigated and discussed. The impact of grain size and Eu³⁺ concentration on the spectroscopic properties of Gd₃Ga₃Al₂O₁₂:Eu³⁺ was checked and analyzed. The spectroscopic properties of the nanopowders were compared to the Gd₃Ga₃Al₂O₁₂:Eu³⁺ single crystal. The influence of effective index of refraction was taken into account in the analysis of transition rates of metastable multiplet and it was found that grain size (surface area) of the nanocrystals has a huge impact on the luminescence decay time.
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