Post annealing induced manipulation of phase and upconversion luminescence of Cr 3+ doped NaYF 4 :Yb,Er crystals

Shivanand H. Nannuri, Suresh D. Kulkarni, C. K. Subash C., Santhosh Chidangil, Sajan D. George

Research output: Contribution to journalArticle

Abstract

The role of post synthesis annealing at different temperatures (200-600 °C) on the structural as well as luminescence properties of NaY 80% F 4 :Yb 17% ,Er 3% prepared via a coprecipitation method was found to change the structure from a cubic to hexagonal phase with a concomitant increase in upconversion luminescence by 12 times for the green region and 17 times for the red region. Addition of the Cr 3+ ions (5-20 mol%) into the host followed by post annealing at 200-600 °C causes that the samples to exhibit phase dependent and upconversion luminescence behavior that depend upon the doping concentration as well as the annealing temperature. The inductively coupled optical emission spectroscopy reveals that only 1/600 times of the desired volume of the co-dopant goes to the lattice and it can manifest visible spectral changes in the diffuse reflectance spectra of the samples. The samples co-doped with Cr 3+ ion concentrations of 10-15% and post-annealed at 600 °C were found to have maximum emission with an enhancement factor of 24 for the green region and 33 for the red region. In addition, the laser power dependent studies reveal that even for the power density levels 3.69 W cm −2 to 32.14 W cm −2 , the samples are in the saturation regime and most of the samples investigated here follow a single photon process, and a few samples show a slope value less than 1 for laser power dependent intensity plots. The results show the remarkable promise of controlled tailoring of the properties of upconversion crystals via post annealing and co-doping.

Original languageEnglish
Pages (from-to)9364-9372
Number of pages9
JournalRSC Advances
Volume9
Issue number17
DOIs
Publication statusPublished - 01-01-2019

Fingerprint

Luminescence
Annealing
Crystals
Doping (additives)
Ions
Optical emission spectroscopy
Lasers
Coprecipitation
Photons
Temperature

All Science Journal Classification (ASJC) codes

  • Chemistry(all)
  • Chemical Engineering(all)

Cite this

@article{f7876ab848c944dd916e6e2e1fc3f053,
title = "Post annealing induced manipulation of phase and upconversion luminescence of Cr 3+ doped NaYF 4 :Yb,Er crystals",
abstract = "The role of post synthesis annealing at different temperatures (200-600 °C) on the structural as well as luminescence properties of NaY 80{\%} F 4 :Yb 17{\%} ,Er 3{\%} prepared via a coprecipitation method was found to change the structure from a cubic to hexagonal phase with a concomitant increase in upconversion luminescence by 12 times for the green region and 17 times for the red region. Addition of the Cr 3+ ions (5-20 mol{\%}) into the host followed by post annealing at 200-600 °C causes that the samples to exhibit phase dependent and upconversion luminescence behavior that depend upon the doping concentration as well as the annealing temperature. The inductively coupled optical emission spectroscopy reveals that only 1/600 times of the desired volume of the co-dopant goes to the lattice and it can manifest visible spectral changes in the diffuse reflectance spectra of the samples. The samples co-doped with Cr 3+ ion concentrations of 10-15{\%} and post-annealed at 600 °C were found to have maximum emission with an enhancement factor of 24 for the green region and 33 for the red region. In addition, the laser power dependent studies reveal that even for the power density levels 3.69 W cm −2 to 32.14 W cm −2 , the samples are in the saturation regime and most of the samples investigated here follow a single photon process, and a few samples show a slope value less than 1 for laser power dependent intensity plots. The results show the remarkable promise of controlled tailoring of the properties of upconversion crystals via post annealing and co-doping.",
author = "Nannuri, {Shivanand H.} and Kulkarni, {Suresh D.} and {Subash C.}, {C. K.} and Santhosh Chidangil and George, {Sajan D.}",
year = "2019",
month = "1",
day = "1",
doi = "10.1039/c9ra00115h",
language = "English",
volume = "9",
pages = "9364--9372",
journal = "RSC Advances",
issn = "2046-2069",
publisher = "Royal Society of Chemistry",
number = "17",

}

Post annealing induced manipulation of phase and upconversion luminescence of Cr 3+ doped NaYF 4 :Yb,Er crystals. / Nannuri, Shivanand H.; Kulkarni, Suresh D.; Subash C., C. K.; Chidangil, Santhosh; George, Sajan D.

In: RSC Advances, Vol. 9, No. 17, 01.01.2019, p. 9364-9372.

Research output: Contribution to journalArticle

TY - JOUR

T1 - Post annealing induced manipulation of phase and upconversion luminescence of Cr 3+ doped NaYF 4 :Yb,Er crystals

AU - Nannuri, Shivanand H.

AU - Kulkarni, Suresh D.

AU - Subash C., C. K.

AU - Chidangil, Santhosh

AU - George, Sajan D.

PY - 2019/1/1

Y1 - 2019/1/1

N2 - The role of post synthesis annealing at different temperatures (200-600 °C) on the structural as well as luminescence properties of NaY 80% F 4 :Yb 17% ,Er 3% prepared via a coprecipitation method was found to change the structure from a cubic to hexagonal phase with a concomitant increase in upconversion luminescence by 12 times for the green region and 17 times for the red region. Addition of the Cr 3+ ions (5-20 mol%) into the host followed by post annealing at 200-600 °C causes that the samples to exhibit phase dependent and upconversion luminescence behavior that depend upon the doping concentration as well as the annealing temperature. The inductively coupled optical emission spectroscopy reveals that only 1/600 times of the desired volume of the co-dopant goes to the lattice and it can manifest visible spectral changes in the diffuse reflectance spectra of the samples. The samples co-doped with Cr 3+ ion concentrations of 10-15% and post-annealed at 600 °C were found to have maximum emission with an enhancement factor of 24 for the green region and 33 for the red region. In addition, the laser power dependent studies reveal that even for the power density levels 3.69 W cm −2 to 32.14 W cm −2 , the samples are in the saturation regime and most of the samples investigated here follow a single photon process, and a few samples show a slope value less than 1 for laser power dependent intensity plots. The results show the remarkable promise of controlled tailoring of the properties of upconversion crystals via post annealing and co-doping.

AB - The role of post synthesis annealing at different temperatures (200-600 °C) on the structural as well as luminescence properties of NaY 80% F 4 :Yb 17% ,Er 3% prepared via a coprecipitation method was found to change the structure from a cubic to hexagonal phase with a concomitant increase in upconversion luminescence by 12 times for the green region and 17 times for the red region. Addition of the Cr 3+ ions (5-20 mol%) into the host followed by post annealing at 200-600 °C causes that the samples to exhibit phase dependent and upconversion luminescence behavior that depend upon the doping concentration as well as the annealing temperature. The inductively coupled optical emission spectroscopy reveals that only 1/600 times of the desired volume of the co-dopant goes to the lattice and it can manifest visible spectral changes in the diffuse reflectance spectra of the samples. The samples co-doped with Cr 3+ ion concentrations of 10-15% and post-annealed at 600 °C were found to have maximum emission with an enhancement factor of 24 for the green region and 33 for the red region. In addition, the laser power dependent studies reveal that even for the power density levels 3.69 W cm −2 to 32.14 W cm −2 , the samples are in the saturation regime and most of the samples investigated here follow a single photon process, and a few samples show a slope value less than 1 for laser power dependent intensity plots. The results show the remarkable promise of controlled tailoring of the properties of upconversion crystals via post annealing and co-doping.

UR - http://www.scopus.com/inward/record.url?scp=85063475485&partnerID=8YFLogxK

UR - http://www.scopus.com/inward/citedby.url?scp=85063475485&partnerID=8YFLogxK

U2 - 10.1039/c9ra00115h

DO - 10.1039/c9ra00115h

M3 - Article

VL - 9

SP - 9364

EP - 9372

JO - RSC Advances

JF - RSC Advances

SN - 2046-2069

IS - 17

ER -