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8464650 
Journal Article 
Ho3+-doped ZnO nano phosphor for low-threshold sharp red light emission at elevated temperatures 
Fabitha, K; Rao, MSR; , 
2017 
1 
Optical Society of America. Journal B: Optical Physics
ISSN: 0740-3224 
OPTICAL SOC AMER 
WASHINGTON 
2485-2492 
WOS:000417652600009 
As an approach to design efficient visible luminescent material at nano scale, Ho3+ ion-doped single-phase zinc oxide (ZnO) nano phosphor to obtain red emission suitable for LED/laser applications is reported. Ho3+-doped ZnO nanoparticles with various concentrations of Ho3+ have been prepared by a simple solgel synthesis technique. Under the excitation of 488 nm, the photoluminescence emission spectra of the nano phosphor exhibit an intense emission with multiple and well-resolved narrow splitting peaking in the range from 640 to 667 nm, which is identified as the emission from the Ho3+ ion, corresponding to F-5(5) -> I-5(8) transition with multiple splitting due to the ZnO crystal field. The required excitation threshold for these emissions is, surprisingly, as low as 33.8 kW/cm(2), and the narrow line width (FWHM < 2 nm) is found to be persistent even at higher temperatures. Such sharp emission from Ho3+ :ZnO nanoparticles could be used for lasing applications. (C) 2017 Optical Society of America