Positron annihilation spectroscopy and photoluminescence investigation of LaOF: Tb3+ nanophosphor fabricated via ultrasound assisted sonochemical route

C. Suresh, H. Nagabhushana, G. P. Darshan, R. B. Basavaraj, S. C. Sharma, D. V. Sunitha, B. Daruka Prasad, James Williams, Hareesh Krishnaiah

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    Abstract

    LaOF:Tb3+ nanophosphors were synthesized by modified sonochemical route using extracted Epigallocatechin gallate (EGCG) from green tea powder as surfactant. Powder X-ray diffraction patterns confirm the tetragonal phase of samples. Morphology of the products was tuned by changing the influential experimental parameters. Positron annihilation spectroscopy (PAS) was used to investigate the defect chemistry of the prepared samples. PAS specified the presence of defects at crystallite boundaries, vacancy clusters and large voids in the prepared compounds. Photoluminescence emission spectra consists of characteristic green emissions owing to 5D4 → 7FJ (J = 6, 5, 4, 3) transitions of Tb3+ ions. The estimated critical distance between dopant ions was found to be ∼16.60 Å is majorly responsible for the dipole-dipole interaction and concentration quenching. The photometric study such as Commission Internationale de L'Eclairage, Correlated Color Temperature and Color purity indicates that the obtained phosphors could be a promising green component for optoelectronic applications in particular to white LEDs.

    LanguageEnglish
    Pages28-39
    Number of pages12
    JournalMaterials Science and Engineering B: Solid-State Materials for Advanced Technology
    Volume224
    DOIs
    StatePublished - 1 Oct 2017

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    Positron annihilation spectroscopy
    positron annihilation
    Photoluminescence
    Ultrasonics
    routes
    Ions
    dipoles
    Color
    gallates
    photoluminescence
    color
    Powders
    Defects
    defects
    Surface-Active Agents
    Optoelectronic devices
    Phosphors
    Diffraction patterns
    spectroscopy
    phosphors

    Cite this

    Suresh, C. ; Nagabhushana, H. ; Darshan, G. P. ; Basavaraj, R. B. ; Sharma, S. C. ; Sunitha, D. V. ; Daruka Prasad, B. ; Williams, James ; Krishnaiah, Hareesh. / Positron annihilation spectroscopy and photoluminescence investigation of LaOF : Tb3+ nanophosphor fabricated via ultrasound assisted sonochemical route. In: Materials Science and Engineering B: Solid-State Materials for Advanced Technology. 2017 ; Vol. 224. pp. 28-39
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    abstract = "LaOF:Tb3+ nanophosphors were synthesized by modified sonochemical route using extracted Epigallocatechin gallate (EGCG) from green tea powder as surfactant. Powder X-ray diffraction patterns confirm the tetragonal phase of samples. Morphology of the products was tuned by changing the influential experimental parameters. Positron annihilation spectroscopy (PAS) was used to investigate the defect chemistry of the prepared samples. PAS specified the presence of defects at crystallite boundaries, vacancy clusters and large voids in the prepared compounds. Photoluminescence emission spectra consists of characteristic green emissions owing to 5D4 → 7FJ (J = 6, 5, 4, 3) transitions of Tb3+ ions. The estimated critical distance between dopant ions was found to be ∼16.60 {\AA} is majorly responsible for the dipole-dipole interaction and concentration quenching. The photometric study such as Commission Internationale de L'Eclairage, Correlated Color Temperature and Color purity indicates that the obtained phosphors could be a promising green component for optoelectronic applications in particular to white LEDs.",
    keywords = "Doppler broadening spectroscopy, Light emitting diodes, Photoluminescence, Positron annihilation spectroscopy, Sonochemical method",
    author = "C. Suresh and H. Nagabhushana and Darshan, {G. P.} and Basavaraj, {R. B.} and Sharma, {S. C.} and Sunitha, {D. V.} and {Daruka Prasad}, B. and James Williams and Hareesh Krishnaiah",
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    Positron annihilation spectroscopy and photoluminescence investigation of LaOF : Tb3+ nanophosphor fabricated via ultrasound assisted sonochemical route. / Suresh, C.; Nagabhushana, H.; Darshan, G. P.; Basavaraj, R. B.; Sharma, S. C.; Sunitha, D. V.; Daruka Prasad, B.; Williams, James; Krishnaiah, Hareesh.

    In: Materials Science and Engineering B: Solid-State Materials for Advanced Technology, Vol. 224, 01.10.2017, p. 28-39.

    Research output: Contribution to journalArticle

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    T1 - Positron annihilation spectroscopy and photoluminescence investigation of LaOF

    T2 - Materials Science and Engineering B

    AU - Suresh,C.

    AU - Nagabhushana,H.

    AU - Darshan,G. P.

    AU - Basavaraj,R. B.

    AU - Sharma,S. C.

    AU - Sunitha,D. V.

    AU - Daruka Prasad,B.

    AU - Williams,James

    AU - Krishnaiah,Hareesh

    PY - 2017/10/1

    Y1 - 2017/10/1

    N2 - LaOF:Tb3+ nanophosphors were synthesized by modified sonochemical route using extracted Epigallocatechin gallate (EGCG) from green tea powder as surfactant. Powder X-ray diffraction patterns confirm the tetragonal phase of samples. Morphology of the products was tuned by changing the influential experimental parameters. Positron annihilation spectroscopy (PAS) was used to investigate the defect chemistry of the prepared samples. PAS specified the presence of defects at crystallite boundaries, vacancy clusters and large voids in the prepared compounds. Photoluminescence emission spectra consists of characteristic green emissions owing to 5D4 → 7FJ (J = 6, 5, 4, 3) transitions of Tb3+ ions. The estimated critical distance between dopant ions was found to be ∼16.60 Å is majorly responsible for the dipole-dipole interaction and concentration quenching. The photometric study such as Commission Internationale de L'Eclairage, Correlated Color Temperature and Color purity indicates that the obtained phosphors could be a promising green component for optoelectronic applications in particular to white LEDs.

    AB - LaOF:Tb3+ nanophosphors were synthesized by modified sonochemical route using extracted Epigallocatechin gallate (EGCG) from green tea powder as surfactant. Powder X-ray diffraction patterns confirm the tetragonal phase of samples. Morphology of the products was tuned by changing the influential experimental parameters. Positron annihilation spectroscopy (PAS) was used to investigate the defect chemistry of the prepared samples. PAS specified the presence of defects at crystallite boundaries, vacancy clusters and large voids in the prepared compounds. Photoluminescence emission spectra consists of characteristic green emissions owing to 5D4 → 7FJ (J = 6, 5, 4, 3) transitions of Tb3+ ions. The estimated critical distance between dopant ions was found to be ∼16.60 Å is majorly responsible for the dipole-dipole interaction and concentration quenching. The photometric study such as Commission Internationale de L'Eclairage, Correlated Color Temperature and Color purity indicates that the obtained phosphors could be a promising green component for optoelectronic applications in particular to white LEDs.

    KW - Doppler broadening spectroscopy

    KW - Light emitting diodes

    KW - Photoluminescence

    KW - Positron annihilation spectroscopy

    KW - Sonochemical method

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