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

doi:10.1016/j.mseb.2017.07.001

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

Research output: Contribution to journal › Article › peer-review

14 Citations (Web of Science)

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 → ⁷F_J (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.

Original language	English
Pages (from-to)	28-39
Number of pages	12
Journal	Materials Science and Engineering B: Solid-State Materials for Advanced Technology
Volume	224
DOIs	https://doi.org/10.1016/j.mseb.2017.07.001
Publication status	Published - 1 Oct 2017

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10.1016/j.mseb.2017.07.001

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Suresh, C., Nagabhushana, H., Darshan, G. P., Basavaraj, R. B., Sharma, S. C., Sunitha, D. V., Daruka Prasad, B., Williams, J., & Krishnaiah, H. (2017). Positron annihilation spectroscopy and photoluminescence investigation of LaOF: Tb³⁺ nanophosphor fabricated via ultrasound assisted sonochemical route. Materials Science and Engineering B: Solid-State Materials for Advanced Technology, 224, 28-39. https://doi.org/10.1016/j.mseb.2017.07.001

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

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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doi = "10.1016/j.mseb.2017.07.001",

language = "English",

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Suresh, C, Nagabhushana, H, Darshan, GP, Basavaraj, RB, Sharma, SC, Sunitha, DV, Daruka Prasad, B, Williams, J & Krishnaiah, H 2017, 'Positron annihilation spectroscopy and photoluminescence investigation of LaOF: Tb³⁺ nanophosphor fabricated via ultrasound assisted sonochemical route', Materials Science and Engineering B: Solid-State Materials for Advanced Technology, vol. 224, pp. 28-39. https://doi.org/10.1016/j.mseb.2017.07.001

Positron annihilation spectroscopy and photoluminescence investigation of LaOF: Tb³⁺ nanophosphor fabricated via ultrasound assisted sonochemical route. / Suresh, C.; Nagabhushana, H.; Darshan, G. P. et al.
In: Materials Science and Engineering B: Solid-State Materials for Advanced Technology, Vol. 224, 01.10.2017, p. 28-39.

Research output: Contribution to journal › Article › peer-review

TY - JOUR

T1 - Positron annihilation spectroscopy and photoluminescence investigation of LaOF

T2 - Tb3+ nanophosphor fabricated via ultrasound assisted sonochemical route

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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DO - 10.1016/j.mseb.2017.07.001

M3 - Article

AN - SCOPUS:85023627174

SN - 0921-5107

VL - 224

SP - 28

EP - 39

JO - Materials Science and Engineering B: Solid-State Materials for Advanced Technology

JF - Materials Science and Engineering B: Solid-State Materials for Advanced Technology

ER -

Suresh C, Nagabhushana H, Darshan GP, Basavaraj RB, Sharma SC, Sunitha DV et al. Positron annihilation spectroscopy and photoluminescence investigation of LaOF: Tb³⁺ nanophosphor fabricated via ultrasound assisted sonochemical route. Materials Science and Engineering B: Solid-State Materials for Advanced Technology. 2017 Oct 1;224:28-39. doi: 10.1016/j.mseb.2017.07.001

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

Abstract

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Spin Dynamics in Magnetic Nanostructures by Spin-Polarized Single- and Two-Electron Spectroscopy

Comprehensive Analysis Facility for Thin Films and Surfaces

LE0668065 - High Resolution Images of Surfaces

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

Abstract

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Projects

Spin Dynamics in Magnetic Nanostructures by Spin-Polarized Single- and Two-Electron Spectroscopy

Comprehensive Analysis Facility for Thin Films and Surfaces

LE0668065 - High Resolution Images of Surfaces

Cite this

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