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Eu 3+ -doped CaWO 4  nanophosphors were synthesised in series for different atomic wt% concentrations (0, 0.5, 1, 2, 5 and 10) of Bi 3+  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 Bi 3+  to Eu 3+  in CaWO 4 :Eu 3+ /Bi 3+  nanophosphors were also investigated. The results revealed that red luminescence of CaWO 4 :2Eu 3+ /1Bi 3+  nanophosphor is 5.4 times stronger than CaWO 4 :2Eu 3+ . It was observed that the forces exist between Bi 3+  and Eu 3+  are due to the interaction of electric dipole-dipole interactions. The chroma of CaWO 4 :2Eu 3+ /1Bi 3+  nanophosphors was calculated to be 97.40%. The energy transfer process was studied by measuring the decay curves due to Bi 3+  and Eu 3+  dopants. Enhanced red emission, high thermal stability, stronger  5 D 0  →  7 F 2  absorption intensity, high colour purity and decay studies indicate that CaWO 4 :Eu 3+ /Bi 3+  nanophosphors are potential candidates to be used in white light-emitting diode ( w LEDs).

Investigating photoluminescence properties of Eu 3+ doped CaWO 4 nanoparticles via Bi 3+ amalgamation for w -LEDs application