Abstract
Detailed structural and spectroscopic characterizations of Pr:Y2O3 nanophosphor have been carried out. On ultraviolet light (at 266 nm) excitation, intense red emission along with weak emissions in blue, green and infrared regions have been observed. The phenomena for the observed emission have been thoroughly explained in the present work and it was finally concluded that the direct excitation through low-lying 4f15d band of Pr3+ ions and through the conduction band of Y2O3 nanophosphor are the main channels for the observed emissions. The calculated quantum efficiency (QE) for the red emission is found to be ~80 % while the CIE coordinates are (0.65, 0.34) quite close to the standard values. These studies clearly indicate that Pr:Y2O3 nanophosphors are promising and futuristic red luminescent material for the development of various display devices and UV detectors. Time resolved spectroscopy has been further used to investigate luminescence dynamics.
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The authors acknowledge the financial support provided by Department of Science and Technology, New Delhi, India. Ms. Kavita Mishra would like to thank Council for Scientific and Industrial Research (CSIR), New Delhi, for Senior Research Fellowship (SRF).
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Mishra, K., Dwivedi, Y., Rai, A. et al. Spectral characteristics of intense red luminescence in Pr:Y2O3 nanophosphor on UV excitation. Appl. Phys. B 109, 663–669 (2012). https://doi.org/10.1007/s00340-012-5235-y
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DOI: https://doi.org/10.1007/s00340-012-5235-y