Modification of luminescence spectra of CaF2:Eu2+.
CaF2:Eu(2+) is a well known phosphor having efficient excitation in the near ultraviolet (NUV) range. Phosphors with NUV excitation are required in newly emerging applications such as photoluminescence liquid crystal displays (PLLCD), solid-state lighting (SSL), and down-conversion for solar cells. However, emission of CaF2:Eu(2+) is around 424 nm. Eye sensitivity drops considerably at these wavelengths. It is thus not useful for display applications for which emission in one of the primary colours (blue - 450 nm, green - 540 nm or red - 610 nm) is required. Efforts were made to modify the Photoluminescence (PL) spectra of CaF2:Eu(2+) to meet these requirements using co-dopants. A Ca0.49 Sr0.50 Eu0.01 F2 phosphor showing better colour coordinates and having an emission maximum around 440 nm was discovered during these studies.
Department of Physics, R.T.M. Nagpur University, Nagpur, 440033, India.
Vartika S
VS
Singh
Physics Department, Shri Ramdeobaba K. N. Engineering College, Katol Road, Nagpur, 440 013, India.
C P
CP
Joshi
Department of Physics, R.T.M. Nagpur University, Nagpur, 440033, India.
S V
SV
Moharil
National Environmental Engineering Research Institute, Nehru Marg, Nagpur, India.
P L
PL
Muthal
National Environmental Engineering Research Institute, Nehru Marg, Nagpur, India.
S M
SM
Dhopte
D002124:Calcium Fluoride / Q000737:chemistry*; D005063:Europium / Q000737:chemistry*; D008163:Luminescent Measurements; D055668:Photochemical Processes; D014961:X-Ray Diffraction
D005063:Europium; D002124:Calcium Fluoride
CaF2; Eu2+; fluoride; luminescence; phosphors