Multi-phonon assisted upconversion emission and …

Multi-phonon assisted upconversion emission and powerdependence studies in LaF3:Er3+ Singha, K. Kumarb,c, , Pandeyc, Raid, D. KumaraaDepartment of Ceramic Engineering, IIT-BHU, Varanasi 221 005, IndiabDepartment of Applied Physics, ISM, Dhanbad 826 004, IndiacNanotechnology Application Centre, Allahabad University, Allahabad 211 002, IndiadLaser & Spectroscopy Laboratory, Physics Department, BHU, Varanasi 221 005, Indiahighlights"Observation of UV bands in LaF3:Er3+phosphor on 532-nm excitation."Multiphonon assisted energymigration from2H11/2(4S3/2) level tothe upper4F3/2,4F5/2and4F7/2levels."Reversal in intensity of 411 and488 nm emission bands withexcitation power or the sampletemperature."Continuum emission at increasedexcitation powers due to the largemultiphonon abstractExcitation power dependence of upconversion emission intensity of Er3+ions in LaF3phosphor is per-formed. Phosphor has shown two-photon excited UV/visible UC bands at the 325 nm, 342 nm, 383 nm,403 nm, 411 nm, 440 nm, 453 nm, 470 nm and 488 nm wavelengths on 532 nm excitation the increased excitation powers Multi-phonon assisted energy migration from2H11/2(4S3/2) level tothe upper4F3/2,4F5/2and4F7/2levels has observed which opened up new channels for the emission at440 nm, 453 nm and 488 nm due to the4F3/2?

lation gives the crystallite size whereas TEM image visualize parti-cle size. A single particle may contain number of crystallites. Fourier transform infrared (FTIR) analysis

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  Multi, Assisted, Size, Emissions, Crystallite, Phonon, Multi phonon assisted upconversion emission, Upconversion, Crystallite size

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