Abstract
Abstract A red-emitting phosphor of Eu 3+ -doped calcium–tellurium–zinc oxide, Ca 3 Te 2 (ZnO 4 ) 3 , with a garnet-type structure was synthesized by high temperature solid-state reactions. This phosphor exhibited a strong red emission. The photoluminescence excitation spectrum showed that Ca 3 Te 2 (ZnO 4 ) 3 :Eu 3+ can be effectively excited by UV–visible light. The property of long-wavelength excitation for this material has a benefit as a red phosphor in application of white light-emitting diodes. The colour coordinates were calculated. The excitation and emission spectra and luminescence decay curves were obtained using a pulsed, tunable, narrowband dye laser. Crystallographic sites and charge compensation mechanism of Eu 3+ ions were discussed. The emission line from Eu 3+ in intrinsic crystallographic site in the lattice was located at 579.56 nm. The emission line from Eu 3+ in another disturbed site, which is created by the defects created by the charge-compensation, was located at 580.88 nm. The disordered crystallographic sites of Eu 3+ are benefit for their strong red luminescence corresponding to the 5 D 0 → 7 F 2 transition.
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