An efficient orange–red‐emitting LiNa3P2O7:Sm3+ pyrophosphate: Structural and optical analysis for solid‐state lighting |
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| Authors: | GR Dillip K Munirathnam B Deva Prasad Raju N John Sushma SW Joo |
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| Institution: | 1. School of Mechanical Engineering, Yeungnam University, Gyeongsan, South Korea;2. Department of Physics, Sri Venkateswara University, Tirupati, India;3. School of Physical Sciences, Reva University, Bangalore, India;4. Department of Future Studies, Sri Venkateswara University, Tirupati, India;5. Department of Biotechnology, Sri Padmavathi Women's University, Tirupati, India |
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| Abstract: | A trivalent rare‐earth ion (Sm3+)‐doped LiNa3P2O7 (LNPO) phosphor was synthesized using a conventional high‐temperature solid‐state reaction route. A predominant orthorhombic phase of LNPO was observed in all X‐ray diffraction patterns. The surface states of the LNPO:Sm phosphor were confirmed by X‐ray photoelectron spectroscopy. Under 401 nm excitation, the Sm‐doped LNPO phosphors showed sharp emission peaks at 563, 600 and 647 nm that are related to the f–f transition of Sm3+ ions. The optimum concentration of Sm3+ (9 mol%) produced Commission Internationale de l'Eclairage chromaticity coordinates, color rendering index and correlated color temperature of (0.564, 0.434), 42 and 1843 K, respectively. |
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| Keywords: | color rendering index LNPO phosphor solid‐state reaction X‐ray photoelectron spectroscopy |
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