Optical and thermal properties of rare earth–doped K4Ca(PO4)2 phosphor |
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| Authors: | Sadaf Gauhar M Mushtaque Vijay B Pawade Sanjay J Dhoble |
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| Institution: | 1. Department of Applied Physics, Guru Nanak Institute of Technology, Nagpur, India;2. Department of Applied Physics, Laxminarayan Institute of Technology, Nagpur, India;3. Department of Physics, RTM Nagpur University, Nagpur, India |
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| Abstract: | The luminescent properties and energy transfer (ET) mechanism in the Ln3+ pair of the RE3+ (RE = Eu3+, Ce3+, Dy3+ and Sm3+) doped K4Ca(PO4)2 phosphor were successfully investigated using a conventional high-temperature solid-state reaction. In the near infrared (NIR) range, Ce3+-doped K4Ca(PO4)2 phosphor exhibited a UV–Vis. emission band, whereas K4Ca(PO4)2:Dy3+ exhibited characteristic emission bands centred at 481 and 576 nm in the near-ultraviolet excitation range. The possibility of ET from Ce3+ to Dy3+ in K4Ca(PO4)2 phosphor was confirmed by a significant increase in the photoluminescence intensity of the Dy3+ ion based on the spectral overlap of acceptor and donor ions. X-ray diffraction, Fourier-transform infrared and thermogravimetric analysis/differential thermal analysis TGA/DTA were carried out to study phase purity, presence of functional groups and amount of weight loss under different temperature regimes. Therefore, the RE3+-doped K4Ca(PO4)2 phosphor may be a stable phosphor host for light-emitting diode applications. |
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| Keywords: | Fourier-transform infrared phosphate photoluminescence RE thermogravimetric analysis/differential thermal analysis X-ray diffraction |
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