Effect of particle size and dopant concentration on photophysical properties of Eu3+-doped rare earth oxysulphide phosphor coatings.
作者： R.P.S. Chakradhar , Bharathibai J. Basu , R.V. Lakshmi
DOI: 10.1016/J.SAA.2010.12.018
关键词:
摘要: Europium-doped rare-earth oxysulphides (red phosphors) are often used as reference luminophore in pyrene-based pressure sensor coatings for aerodynamic applications. Different red phosphor samples were characterized their particle size, chemical composition, photoluminescent properties and temperature sensitivity. The samples were using energy-dispersive X-ray spectroscopy (EDX) elemental analysis and scanning electron microscopy (SEM) morphology size measurement. was in the range of 1.5–5.7�m with hexagonal or spherical shape. It found that higher europium content exhibited luminescent emission intensity. prepared by spraying a dispersion the material silicone resin. Smooth obtained smaller particle size. Upon 334nm excitation, showed characteristic luminescence 5D0→7FJ (J=0, 1, 2, 3, 4) Eu3+ ions. electronic transition located at 626nm (5D0→7F2) ions stronger than the magnetic dipole 595nm (5D0→7F1). Luminescence decay curves obeyed double exponential behaviour. temperature sensitivity −0.012 to −0.168%/◦C 25–50 ◦C.
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