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Updated: Aug 8, 2025

Low-energy Cathodoluminescence for OxyNitride Phosphors
Published on: November 15, 2016
Optical and thermal properties of rare earth-doped K4 Ca(PO4 )2 phosphor
Sadaf Gauhar M Mushtaque1, Vijay B Pawade2, Sanjay J Dhoble3
1Department of Applied Physics, Guru Nanak Institute of Technology, Nagpur, India.
Abstract:
The luminescent properties and energy transfer (ET) mechanism in the Ln3+ pair of the RE3+ (RE = Eu3+ , Ce3+ , Dy3+ and Sm3+ ) doped K4 Ca(PO4 )2 phosphor were successfully investigated using a conventional high-temperature solid-state reaction. In the near infrared (NIR) range, Ce3+ -doped K4 Ca(PO4 )2 phosphor exhibited a UV-Vis. emission band, whereas K4 Ca(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 K4 Ca(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 K4 Ca(PO4 )2 phosphor may be a stable phosphor host for light-emitting diode applications.
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