Authors : D. Chikte (Awade)a* , S. K. Omanwarb , S. V. Moharilc
Page Nos : 225-235
Description :
The intense blue emitting phosphor KCaBO3:xCe3+ is synthesized by solution
combustion synthesis at comparatively lower temperature using urea as fuel. The
method of synthesis is by simple, time saving and economical. X-ray power diffraction
(XRD) analysis confirmed the formation of the said phosphor. Photoluminescence
measurements showed that the phosphor exhibited intense emission at 427nm,
corresponding to 5d→2F7/2 transition of Ce3+
.
The excitation spectra monitored at 427nm shows peaks at 287nm and broad
excitation band peaking at 360nm. The later lies in near ultraviolet (350-410nm)
emission of UV LED. The phosphor KCaBO3:xCe3+ shows colour coordinates CIE 1931
as (0.14, 0.11) whereas the commercial blue phosphor BAM shows the colour coordinates
as (0.14, 0.107), respectively. The SEM image recorded shows the particles
with an irregular shape and the particle size ranging in5-10μm. The phosphor
KCaBO3:Ce3+can be a promising blue phosphor in solid state lighting application.
