Abstract
In the present work, a visible to ultraviolet C (UVC) up-conversion Er3+ doped yttrium aluminium garnet (YAG) ceramic phosphor was developed by a high temperature solid state reaction method. The structural characterization of the prepared phosphor was carried out using X-ray diffraction analysis and transmission electron microscopy techniques. The up-conversion behaviour of the phosphor was studied by recording the emission spectra of the phosphor under a 460 nm blue LED source. The emission spectrum was obtained in the UV region containing peaks centred at 217, 256, 275 and 312 nm. The emitted UV radiation belongs to the germicidal UV wavelength; therefore this behaviour of the phosphor was applied for the inactivation of surface born microbes through the emitted radiation. The emission behaviour of the phosphor was further investigated by LED encapsulation. The up-conversion emission increases with an increase in the crystal size.
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