title: Luminescence and advanced mass spectroscopic characterization of sodium zinc orthophosphate phosphor for low-cost light-emitting diodes.
abstract: A new rare-earth-free NaZnPO4:Mn(2+) (NZP:Mn) phosphor powder has been developed by our group and investigated meticulously for the first time using secondary ion mass spectroscopy and chemical imaging techniques. The studies confirmed the effective incorporation of Mn(2+) into the host lattice, resulting in an enhancement of photoluminescence intensity. Phase purity has been verified and structure parameters have been determined successfully by Rietveld refinement studies. The NZP:Mn phosphor powder exhibits strong absorption bands in the ultraviolet and visible (300-470 nm) regions with a significant broad yellow-green (~543 nm) emission due to the characteristic spin forbidden d-d transition ((4)T1→(6)A1) of Mn(2+) ions, indicating weak crystal field strength at the zinc-replaced manganese site. The decay constants are a few milliseconds, which is a pre-requisite for applications in many display devices. The results obtained suggest that this new phosphor powder will find many interesting applications in semiconductor physics, as cost-effective light-emitting diodes (LEDs), as solar cells and in photo-physics.
authors.affiliation: Academy of Scientific and Innovative Research (AcSIR), CSIR-National Physical Laboratory, Dr K.S. Krishnan Road, New Delhi, 110 012, India.
authors.forename: Savvi
authors.initials: S
authors.lastname: Mishra
authors.affiliation: Academy of Scientific and Innovative Research (AcSIR), CSIR-National Physical Laboratory, Dr K.S. Krishnan Road, New Delhi, 110 012, India.
authors.forename: G
authors.initials: G
authors.lastname: Swati
authors.affiliation: Academy of Scientific and Innovative Research (AcSIR), CSIR-National Physical Laboratory, Dr K.S. Krishnan Road, New Delhi, 110 012, India.
authors.forename: B
authors.initials: B
authors.lastname: Rajesh
authors.affiliation: Academy of Scientific and Innovative Research (AcSIR), CSIR-National Physical Laboratory, Dr K.S. Krishnan Road, New Delhi, 110 012, India.
authors.forename: Kriti
authors.initials: K
authors.lastname: Tyagi
authors.affiliation: Academy of Scientific and Innovative Research (AcSIR), CSIR-National Physical Laboratory, Dr K.S. Krishnan Road, New Delhi, 110 012, India.
authors.forename: Bhasker
authors.initials: B
authors.lastname: Gahtori
authors.affiliation: Academy of Scientific and Innovative Research (AcSIR), CSIR-National Physical Laboratory, Dr K.S. Krishnan Road, New Delhi, 110 012, India.
authors.forename: B
authors.initials: B
authors.lastname: Sivaiah
authors.affiliation: Academy of Scientific and Innovative Research (AcSIR), CSIR-National Physical Laboratory, Dr K.S. Krishnan Road, New Delhi, 110 012, India.
authors.forename: N
authors.initials: N
authors.lastname: Vijayan
authors.affiliation: Academy of Scientific and Innovative Research (AcSIR), CSIR-National Physical Laboratory, Dr K.S. Krishnan Road, New Delhi, 110 012, India.
authors.forename: M K
authors.initials: MK
authors.lastname: Dalai
authors.affiliation: Academy of Scientific and Innovative Research (AcSIR), CSIR-National Physical Laboratory, Dr K.S. Krishnan Road, New Delhi, 110 012, India.
authors.forename: A
authors.initials: A
authors.lastname: Dhar
authors.affiliation: Academy of Scientific and Innovative Research (AcSIR), CSIR-National Physical Laboratory, Dr K.S. Krishnan Road, New Delhi, 110 012, India.
authors.forename: S
authors.initials: S
authors.lastname: Auluck
authors.affiliation: Department of Applied Physics, Delhi Technological University, New Delhi, 110 042, India.
authors.forename: M
authors.initials: M
authors.lastname: Jayasimhadri
authors.affiliation: Academy of Scientific and Innovative Research (AcSIR), CSIR-National Physical Laboratory, Dr K.S. Krishnan Road, New Delhi, 110 012, India.
authors.forename: D
authors.initials: D
authors.lastname: Haranath
mesh_terms: D008027:Light; D049449:Luminescence; D008163:Luminescent Measurements; D008345:Manganese / Q000737:chemistry*; D010316:Particle Size; D010710:Phosphates / Q000737:chemistry*; D011789:Quantum Theory; D012964:Sodium / Q000737:chemistry*; D018629:Spectrometry, Mass, Secondary Ion; D013499:Surface Properties; D013997:Time Factors; D014961:X-Ray Diffraction; D015032:Zinc / Q000737:chemistry*
chemical_list: D010710:Phosphates; D008345:Manganese; D012964:Sodium; D015032:Zinc
keywords: ToF SIMS; luminescence; orthophosphates