Articles written in Bulletin of Materials Science

    • Enhancement and luminescence properties of Eu$^{3+}$, Sm$^{3+}$ co-doped KMgPO$_4$ phosphor with variable concentration of Eu$^{3+}$ for w-LEDs


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      This study reports enhancement in emission efficiency of Eu$^{3+}$ and Sm$^{3+}$ co-doped KMgPO$_4$ phosphor. The sample was synthesized by a conventional solid-state reaction for the variable concentration of europium. The structural analysis of the sintered phosphor was done by using powder X-ray diffraction, also the photoluminescence behaviour, energy transformation of Sm$^{3+}$ to Eu$^{3+}$ and decay properties were studied throughout. It was found that the main intense peak of Sm$^{3+}$-doped sample reduced when increasing Eu$^{3+}$ concentration and this shows the energy transfer betweenEu$^{3+}$ and Sm$^{3+}$ ions, also the decay time of particle get reduced with increasing Eu$^{3+}$ concentration. So by adjusting the energy transfer between Eu$^{3+}$ and Sm$^{3+}$ ions using an optimum concentration of europium ion can improve the emission efficiency and enlarge the excitation spectra and therefore, enhanced the emission efficiency under 402 nm n-UV excitation. This study shows the new methodology for developing the red-emitting phosphor with enhanced emission efficiency. The calculated CIE coordinated for co-doped phosphor was estimated to $x = 0.610$ and $y = 0.381$.

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