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Semiconductor Physics, Quantum Electronics & Optoelectronics. 2011. V. 14, N 4. P. 461-464.
Investigation of luminescent properties inherent
to SrTiO3:Pr3+
1V. Lashkaryov Institute of Semiconductor Physics, National Academy of Sciences of Ukraine,
41, prospect Nauky, 03028 Kyiv, Ukraine
Abstract.
The red-emitting SrTiO 3 :Pr 3+ ,Al luminophors that can be used for the white
light emitting diodes (LEDs) were prepared using the sol-gel method. The starting
materials were SrCl 2 , Ti (O – i – C 3 H 7 ) 4 , Al(NO 3 ) 3 ·9H 2 O and PrCl 3 . The reaction
between them results in a mixture of compounds that transform into single-phase
SrTiO 3 :Pr 3+ ,Al after annealing in air. Displacement of Ti out of the SrTiO 3 lattice caused
by substitution with Al and formation of individual crystalline TiO 2 phase (rutile) were
observed. PL spectra show the high-intense red peak (λ = 617 nm), the same high-intense
peak with the full width at half maximum (FWHM) 20 nm was found in
cathodoluminescence spectra. The increase of the aluminium concentration from 0 up to
15 mol.% leads to approximately two-fold increase in the luminance. The latter increases
from 180 up to 350 cd/m 2 at the anode voltage 10 kV and current density 30 μA/cm 2 .
Keywords: luminophor, SrTiO 3 :Pr 3+ ,Al, photoluminescence, cathodoluminescence, LED.
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