Thermal annealing and doping induced tailoring of phase and upconversion luminescence of NaYF4:Yb Er microcrystals

Nannuri, Shivanand H and Adnan, Sana and Santhosh, C and George, Sajan D (2022) Thermal annealing and doping induced tailoring of phase and upconversion luminescence of NaYF4:Yb Er microcrystals. Nanoscale and Microscale Thermophysical Engineering, 26 (1). pp. 1-16. ISSN 1556-7265

[img] PDF
RMS - 00015040.pdf - Published Version
Restricted to Registered users only

Download (2MB) | Request a copy

Abstract

The influence of Mn2+ ion concentration (x = 0–20 mol%) as well as the role of thermal-annealing temperature (400–600°C) on the structural as well as luminescence properties of NaYF4:Yb, Er (Y: 78-x%, Yb: 20%, Er: 2%) microcrystals prepared via a coprecipitation method is investigated. The cubic phase of the as-prepared NaYF4:Yb, Er (Y: 78%, Yb: 20%, Er: 2%) was found to remain intact upon the addition of the Mn2+ ions, but the thermalannealing elucidates that the phase of the sample depends upon the annealing temperature as well as the Mn2+ ion concentration. Among the Mn2+ ion co-doped samples, 3 mol% doped samples dominant to have a maximum positive influence on the upconversion luminescence of the sample, and a further increase in concentration leads to the concentration-induced quenching of the upconversion luminescence. Moreover, the enhancement factor of green (2H11=2!4I15=2and4S3=2!4I15=2), as well as red (4F9=2!4I15=2) emission, depend upon the annealing temperature, with a maximum enhancement factor of 5 and 3.12 times for the sample annealed at 400°C, 8.6 and 7.25 times for the sample annealed at 500°C, and 6 and 4 times for the sample annealed at 600°C, as compared to Mn2+ ion undoped samples. The maximum emission strength for the green as well as red is observed for the sample annealed at 600°C and co-doped with 3 mol Mn2+ ions. The laser power-dependent study on all the samples shows that the upconversion process is a multi-photon process, predominantly a two-photon process.

Item Type: Article
Uncontrolled Keywords: Upconversion luminescence; co-precipitation method; codoping; luminescence enhancement; thermalannealing.
Subjects: Departments at MU > Atomic Molecular Physics
Depositing User: KMC Library
Date Deposited: 18 Jul 2022 03:57
Last Modified: 18 Jul 2022 03:57
URI: http://eprints.manipal.edu/id/eprint/158918

Actions (login required)

View Item View Item