Up-conversion luminescence and optical temperature sensing of Er3+, Yb3+ co-doped Gd2O3 phosphors with different F-/Ln3+

Rare‐earth composite as optical upconversion temperature sensor

“…The sensitivity of NaGdF 4 : Yb 3+ /Er 3+ /5 mol%Zn 2+ phosphor shows a downward trend with the increase of temperature. It reached the maximum value of 0.0134 K –1 at 75 K, indicating that NaGdF 4 : Yb 3+ /Er 3+ /5 mol%Zn 2+ phosphor is comparatively good material for an optical temperature sensor [9, 10].…”

Enhancement of photoacoustic and upconversion emission in Mg2+/Zn2+ codoped Gd2O3: Er3+/Yb3+ phosphor using 980 nm excitation

“…In the recorded UC emission spectrum showed emission bands around at 527, 548 nm, and 672 nm due to the 2 H 11/2 / 4 I 15/2 , 4 S 3/2 / 4 I 15/2 and 4 F 9/2 / 4 I 15/2 transitions, respectively. 9,41,[47][48][49] In the spectrum, maximum intensity measured for the band 548 nm (523 nm) situated in green region and another low intense peak observed near at the red region (672 nm). The schematic energy level diagram of UC mechanism is provided in Fig.…”

“…Rare earth doped phosphor materials have been broadly studied for different applications including light emitting diodes (LEDs), solid-state lighting, night glowing panels and emergency signs, high-denition televisions (HD-TVs), latent ngerprint detection, temperature sensing, medical diagnostics, in vivo imaging and laser therapy. [1][2][3][4][5][6][7][8][9][10] The interest in rare earth doped phosphor materials has augmented due to the exceptional optical properties of rare earth ions. [11][12][13][14][15] The upconversion (UC) luminescence of rare earth ions mostly originates from the electronic transitions within the 4f-shell of the rare earth ions.…”

Eulytite-type Ba3Yb(PO4)3:Tm/Er/Ho as a high sensitivity optical thermometer over a broad temperature range

“…By optimizing the calcination process, they increased the luminescence intensity of the samples. The maximum absolute sensitivity for optical temperature sensing reached 1.27% K −1 at 574 K. 18…”

“…By optimizing the calcination process, they increased the luminescence intensity of the samples. The maximum absolute sensitivity for optical temperature sensing reached 1.27% K À1 at 574 K. 18 Lanthanide elements (Pr, Nd, Eu, Ho, Er, Tm) and transition metal elements (Cr, Mn) have proven to be highly effective luminescent centers for optical thermometry. [19][20][21][22] For instance, Back, M et al discussed the potential of Nd 3+ -activated bismuth silicate systems as ratio thermometers, demonstrating relative sensitivity values of 1.43%ÁK À1 and 1.33%ÁK À1 at 300 K for Bi 2 SiO 5 :Nd@SiO 2 and Bi 4 Si 3 O 12 :Nd@SiO 2 , respectively.…”