Investigation reveals that SnO2 nanoparticles exhibit varied optical properties with increasing thermal decomposition temperature, suggesting potential for blue light LEDs.
SnO2 nanoparticles were synthesized by thermal decomposition technique by varying the temperature from 300°C to 600°C. The synthesized nanoparticles (9 nm) were of rutile (tetragonal) phase with orientation along [110], [101], [200], [211], [220], [310], [112], [301], [202] crystal planes. The peak intensity of the crystal planes become prominent with increase in decomposition temperature while the impurity phases diminish. The crystallite size and micro strain of the nanoparticle was calculated using William Hall equation with union deformation model. SnO2 nanoparticles synthesized at 600°C shows a positive strain of 0.3571x10-3 indicating lattice expansion. At thermal decomposition of 5000C the sample has maximum transparency with band gap at ~ 4.19 eV and has broad emission in blue region of the EM Spectra with high intensity (5 x105 counts), rendering it to be a suitable material for blue light LED.
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Velmurugan et al. (2025) studied this question.