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Abstract
ABSTRACT Eu3+-doped CaWO4 nanophosphors were synthesised in series for different atomic wt% concentrations (0, 0.5, 1, 2, 5 and 10) of Bi3+ by polyol method. Their structure and morphology were characterised using X-ray diffraction (XRD) and scanning electron microscopy (SEM). The photoluminescence properties and energy transfer from Bi3+ to Eu3+ in CaWO4:Eu3+/Bi3+ nanophosphors were also investigated. The results revealed that red luminescence of CaWO4:2Eu3+/1Bi3+ nanophosphor is 5.4 times stronger than CaWO4:2Eu3+. It was observed that the forces exist between Bi3+ and Eu3+ are due to the interaction of electric dipole-dipole interactions. The chroma of CaWO4:2Eu3+/1Bi3+ nanophosphors was calculated to be 97.40%. The energy transfer process was studied by measuring the decay curves due to Bi3+ and Eu3+ dopants. Enhanced red emission, high thermal stability, stronger 5D0 → 7F2 absorption intensity, high colour purity and decay studies indicate that CaWO4:Eu3+/Bi3+ nanophosphors are potential candidates to be used in white light-emitting diode (wLEDs).
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