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Synthesis and design of NaYF 4 microprisms via a microwave‐assisted approach for highly sensitive optical thermometry applications
Author(s) -
Som Sudipta,
Lu ChungHsin,
Yang CheYuan,
Das Subrata
Publication year - 2021
Publication title -
journal of the american ceramic society
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.9
H-Index - 196
eISSN - 1551-2916
pISSN - 0002-7820
DOI - 10.1111/jace.17783
Subject(s) - nucleation , materials science , microwave , nanoparticle , crystal (programming language) , chemical engineering , analytical chemistry (journal) , chemistry , nanotechnology , organic chemistry , physics , quantum mechanics , computer science , engineering , programming language
Abstract Hexagonal NaYF 4 : Er 3+ /Yb 3+ (β‐NaYF 4 ) microprisms with uniform particle sizes were synthesized via a microwave‐assisted hydrothermal method (MWHM). Nucleation and crystal growth were significantly surpassed owing to the microwave irradiation. Cubic‐NaYF 4 : Er 3+ /Yb 3+ (α‐NaYF 4 ) nanoparticles were transformed into β‐NaYF 4 microprisms with reaction time in between 10 and 120 minutes at 180°C. The shape of the particles was enhanced via controlling the nucleation process with optimized irradiation duration and heating rates. The size distribution of β‐NaYF 4 microprisms was further improved via regulating the concentration of chelating agents and pH values in the precursor solution. β‐NaYF 4 microprisms displayed red and green color emissions for 980 nm excitation owing to the 4 F 9/2 and 2 H 11/2 / 4 S 3/2 → 4 I 15/2 transitions of Er 3+ respectively. The ratio ( 2 H 11/2 / 4 S 3/2 → 4 I 15/2 ) between green fluorescence intensities (FIR) of β‐NaYF 4 microprisms was recorded with the variation in temperature from 303 K to 550 K. The recorded FIR values obeyed Boltzmann distribution and the distribution was used to evaluate the sensitivity. The optimum absolute sensitivity was achieved as 0.0044 K −1 at 490 K with promising resolution, reversibility, and stability. Furthermore, the power‐dependent variations in FIR values implied the suitability of β‐NaYF 4 microprisms in measuring the laser‐induced heating effects.