Boltzmann- and Non-Boltzmann-Based Thermometers in the First, Second and Third Biological Windows for the SrF2:Yb3+, Ho3+ Nanocrystals Under 980, 940 and 915 nm Excitations

Table 1 The parameters of λ_ex, λ_em, maximum \(S_{R}\), temperature range of the Ho³⁺-doped materials

Samples	λ_ex (nm)	λ_em (nm)	NTCLs or TCLs	Temperature range (K)	\(S_{R}\)(%∙K⁻¹)	References
NaYF₄: Ho³⁺	447	542, 645	TCLs	113–473	0.93 (302 K)	[12]
BaTiO₃:Ho³⁺,Yb³⁺	980	539, 547	TCLs	305–515	0.34 (305 K)	[16]
LiYF₄: Yb³⁺, Ho³⁺	976	655, 546	TCLs	100–500	0.0129 (156 K)	[30]
BiPO₄:Yb³⁺,Ho³⁺	980	652, 657	TCLs	313–573	0.079 (333 K)	[31]
NBT:Ho³⁺,Yb³⁺	980	546, 757	TCLs	93–300	0.29 (93 K)	[41]
LiYb(WO₄)₂:Yb³⁺,Ho³⁺	980	541, 663	TCLs	298–573	0.7 (300 K)	[44]
(K_0.5Na_0.5)NbO₃:Ho³⁺	980	526, 552	TCLs	300–650	0.75 (430 K)	[45]
SrF₂:Yb³⁺,Ho³⁺	980	648, 541	TCLs	303–573	0.94 (303 K)	This work
		1186, 1012	NTCLs	303–573	0.45 (523 K)	This work
		1950, 2020	NTCLs	303–573	0.40 (523 K)	This work
	940	648, 541	TCLs	303–573	0.57 (303 K)	This work
		1186, 1012	NTCLs	303–573	0.23 (303 K)	This work
		1950, 2020	NTCLs	303–573	0.17 (398 K)	This work
	915	648, 541	TCLs	303–573	0.85 (303 K)	This work
		1186, 1012	NTCLs	303–573	0.15 (303 K)	This work
		1950, 2020	NTCLs	303–573	0.24 (303 K)	This work