Abstract
Er3+ doped ZnO–CaO–Al2O3 nano-composite phosphor has been synthesized through combustion method and its emission and harmonic generation properties have been studied. The X-ray diffraction and thermal analysis techniques have been used to prove the dual phase (ZnO and CaO–Al2O3) nature of the phosphor. The phosphor has shown up-conversion emission on near-infra-red (976nm) excitation and down-conversion emission on 355nm excitation in presence of Er3+ and thus behaves as a dual mode phosphor. On excitation with 976nm diode laser, material shows color tunability (calcination of composite material at different temperatures). Formation of ZnO nanocrystals on heat treatment of as-synthesized sample has shown its characteristic emission at 388nm and also the energy transfer from ZnO to Er3+ ions. The low temperature emission measurements have been carried out and the results have been discussed. Phosphor has shown strong second harmonic generation (SHG) at 532nm on 1064nm and at 266nm on 532nm excitation.
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