Enhanced up‐conversion luminescence and optical thermometry characteristics of Er³⁺/Yb³⁺ co‐doped Sr₁₀(PO₄)₆O transparent glass‐ceramics

Abstract

In this paper, the Yb 3+ /Er 3+ co-doped parent glass (PG) with composition (in mol%) of 30P 2 O 5-10B 2 O 3-38SrO-22K 2 O and transparent glass-ceramics (GCs) containing hexagonal Sr 10 (PO 4) 6 O nanocrystals (NCs) were synthesized for the first time by melt-quenching method and subsequent heating treatment in air. Under 980 nm laser prompting, the GCs samples showed intense red and green up-conversion emissions compared to those characteristics for the PG sample. The emission intensities varied with Er 3+ concentration and heat treatment conditions. Furthermore, in Yb 3+ /Er 3+ co-doped GCs specimens, the optical thermometry was researched by means of fluorescence intensity ratio (FIR) of 4 S 3/2 and 2 H 11/2 levels. The GC sample heated at 620°C for 5 hours possessed a high relative temperature sensitivity (S r) of 0.769% K −1 at 303 K and the maximal absolute temperature sensitivity (S a) of 5.951 × 10 −3 K −1 at 663 K, respectively. It is expected that the as-fabricated GC materials with Sr 10 (PO 4) 6 O NCs are promising efficient up-conversion materials for optical temperature sensor.

Up‐conversion and temperature sensing properties of Na2GdMg2(VO4)3:Yb3+,Er3+ phosphors

“…As temperature sensing materials, absolute sensitivity ( S A ) and relative sensitivity ( S R ) can be estimated as below, 18, 20, 24, 37 …”

“…29,30 The physics of resin flow into a mold under pressure is similar to the seepage problem and so similar approaches have been used also to model the flow of resin into a mold containing fiber mats. 23,[31][32][33][34][35][36][37][38] The models are used in these cases to determine the resin flow front and mold filling times corresponding to different infiltration conditions.…”

“…As temperature sensing materials, absolute sensitivity (S A ) and relative sensitivity (S R ) can be estimated as below, 18,20,24,37 (3 ( A survey of the published literature modeling of CMCs has been studied by a n ers. Processes that have been modeled CVD, 17,18 CVI, [19][20][21][22] and Sol-Gel Infiltrat of alumina matrix in eight-harness satin has been studied numerically in Ref.…”

“…In recent years, vanadate‐based phosphors have aroused extensive concerns 19,35,36 . Among vanadate phosphors, Na 2 GdMg 2 (VO 4 ) 3 is chosen as a superb substrate for rare‐earth (RE) ions doping owing to the same valences and close ionic radii between Gd 3+ and RE 3+ ions 37 . For example, Na 2 GdMg 2 (VO 4 ) 3 :Er 3+ red phosphors with heavy doping concentration and excellent thermal stability were reported 38 .…”

“…19,35,36 Among vanadate phosphors, Na 2 GdMg 2 (VO 4 ) 3 is chosen as a superb substrate for rare-earth (RE) ions doping owing to the same valences and close ionic radii between Gd 3+ and RE 3+ ions. 37 For example, Na 2 GdMg 2 (VO 4 ) 3 :Er 3+ red phosphors with heavy doping concentration and excellent thermal stability were reported. 38 Consequently, the investigation of UC luminescence, the Yb 3+ -Er 3+ energy transfer (ET) and the temperature measurement performances of Na 2 GdMg 2 (VO 4 ) 3 :Yb 3+ , Er 3+ samples are interesting and desired to be realized.…”