Thermometry of red nanoflaked SrAl12O19:Mn4+ synthesized with boric acid flux

Yang, Su–Hua; Lee, Yi‐Ching; Hung, Ying-Che

doi:10.1016/j.ceramint.2018.03.242

Cited by 28 publications

(7 citation statements)

References 41 publications

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“…In this decade, dual rare‐earth (RE) ions co‐doped materials resulted from phonon‐assisted energy transfer and RE/quantum‐dots hybrid nanostructures depending on the different thermal quenching behaviors have already been efficiently synthesized. In addition, transition metal (TM) activators with 3 d n electronic configurations turned out to be an outstanding self‐referencing indicator that RE/TM‐co‐doped phosphors showed outstanding thermal sensitivity due to Stokes and up‐conversion anti‐Stokes …”

Section: Introductionmentioning

confidence: 99%

“…In addition, transition metal (TM) activators with 3d n electronic configurations turned out to be an outstanding self-referencing indicator that RE/TM-co-doped phosphors showed outstanding thermal sensitivity due to Stokes and up-conversion anti-Stokes. 12,[23][24][25] In this work, we approached this neoteric binary optical temperature indicator involving dual TM ions with distinctly different temperature dependences by adopting the highly temperature-sensitive Bi 3+ as the temperature detecting signal while the temperature-insensitive Mn 4+ as a reference signal, which was environmentally friendly and economically rationally compared to RE ions-doped materials. Studies have shown that Bi 3+ acted as an excellent sensitizer ion to enhance the luminescence intensity of activator.…”

Section: Introductionmentioning

confidence: 99%

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None‐rare‐earth activated Ca₁₄Al₁₀Zn₆O₃₅:Bi³⁺,Mn⁴⁺ phosphor involving dual luminescent centers for temperature sensing

et al. 2019

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We proposed a new strategy for utilizing rare‐earth–free‐activated self‐referencing optical material with dual activators for temperature sensing, which was synthesized by conventional high‐temperature solid‐state method and was scarcely reported. Originating from the different thermal responses of Mn4+ and Bi3+ ions, a Mn4+/Bi3+‐based dual‐emitting fluorescence intensity ratio (FIR) as dual‐modal temperature signal for temperature sensing has been corroborated as a promising temperature sensing method. Due to the outstanding thermal resistance of activator Mn4+ (anti‐Stokes) benefiting from the unique 3dn electronic configurations and strong field strength of host, together with the energy transfer from Bi3+ to Mn4+ ions and excellent thermal quenching of Bi3+, this temperature‐sensitive phosphor displayed both an extensive detection temperature region ranging from 303 to 563 K and excellent absolute and relative sensitivity of 0.0147 K−1 and 1.21% K−1 respectively, both of which are higher than some foregoing reported optical materials. Furthermore, two well‐separated emission peaks at blue and red regions enabled an excellent signal discriminability and accurate temperature detection under the single‐wavelength excitation of 340 nm. In addition, freedom from rare‐earth ions contributed its possibility to be mass‐produced for meeting the needs of economic rationality, nontoxic and convenient synthesis. It is anticipated that this preliminary study would arouse peoples’ attention on exploring more novel dual activator‐based optical thermometric materials in absence of rare‐earth ions.

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Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

None‐rare‐earth activated Ca₁₄Al₁₀Zn₆O₃₅:Bi³⁺,Mn⁴⁺ phosphor involving dual luminescent centers for temperature sensing

et al. 2019

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“…As shown in Figure d–f, the S a values become larger in the range of 298–523 K. The data reach maximum values of 0.027 K –1 (mode 1, I 590nm / I 446nm ), 0.067 K –1 (mode 2, I 621nm / I 446nm ), and 0.066 K –1 (mode 3, I 705nm / I 446nm ) at 523 K. The change of S r is interrelated to S a and FIR derived from eq , and its maximal values are given as follows: 1.14% K –1 (mode 1, I 590nm / I 446nm ), 1.27% K –1 (mode 2, I 621nm / I 446nm ), and 1.26% K –1 (mode 3, I 705nm / I 446nm ) at 298 K. Compared with the S a / S r of mode 1 and mode 3, the S a and S r obtained by mode 2 are higher. The S a reaches a maximum value of 0.067 K –1 at 523 K. The highest value for S r is 1.27% K –1 at 298 K. Moreover, these two values are better than most of the thermal sensing materials via the use of the FIR technology as shown in Table . − To accurately assess the thermal performance of materials, the temperature resolution (δ T ) has been measured and it can be calculated by the following formula: δFIR/FIR means the relative error in the measurement. The relative error value through the calculation is 0.48%.…”

Section: Resultsmentioning

confidence: 99%

Realization of an Optical Thermometer via Structural Confinement and Energy Transfer

Mei

et al. 2021

Inorg. Chem.

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The influence of temperature on a variety of physiological or chemical processes has generated considerable interest, and recently noninvasive lanthanide-incorporated optical thermometers have been considered as promising candidates for monitoring its changes at different scales. Herein, a novel Bi 3+ -activated Sr 3−x Gd x GaO 4+x F 1−x phosphor with tunable color has been constructed by a cooperative cation−anion substitution strategy with to the replacement of [Sr 2+ −F − ] by [Gd 3+ − O 2− ]. When x = 0, the sample Sr 3 GaO 4 F/Bi 3+ possesses a peak wavelength at 438 nm, and this value will shift to 470 nm if x is equal to 1 (Sr 2 GdGaO 5 /Bi 3+ ). In addition, photoluminescence tuning from blue to red has been realized successfully by an efficient Bi 3+ → Eu 3+ energy migration model in Sr 2.6 Gd 0.4 GaO 4.4 F 0.6 samples. The specific Bi 3+ → Eu 3+ energy transfer has been explained by dipole−dipole interactions derived from a model of the Dexter pathway. Intriguingly, the two dopants (a blue signal from Bi 3+ and a red signal from Eu 3+ ) possess different thermal responses to increasing temperature. Accordingly, the intensity ratio values are sensitive to the temperature changes. The energy level cross relaxation causes the quenching effect of Bi 3+ , and the multi-phonon de-excitation mode leads to the thermal quenching of Eu 3+ . At room temperature (298 K), the determined maximum relative sensitivity (S r ) is 1.27% K −1 . Moreover, the absolute sensitivity (S a ) is 0.067 K −1 since the temperature is elevated to 523 K. The collected results are superior to most of the reported optical thermometry materials.

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“…Some fluxes such as boric acid has been introduced into the crystal structure of many phosphors and the results show that it can improve the emission performance remarkably because of the smoothed particle morphology and the enhanced crystallinity of prepared phosphors . However, doping H 3 BO 3 into Ca 3 Al 4 ZnO 10 :4%Ti 4+ phosphor may alter the lifetimes . As shown in Figure A and B, we attempted to increase the emission intensity of CAZO:Ti 4+ by doping diverse amounts of H 3 BO 3 (0%, 0.5%, 1%, 1.5%, 2% and 3%).…”

Section: Resultsmentioning

confidence: 99%

Exploration of bluish violet‐emitting phosphor Ca₃Al₄ZnO₁₀:Ti⁴⁺ with enhanced emission by Ca²⁺ vacancies

Zhou

et al. 2018

J Am Ceram Soc

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In this paper, we introduced a bluish violet‐emitting phosphor Ca3Al4ZnO10:Ti (IV) (CAZO:Ti4+) synthesized by high‐temperature solid‐state reaction. Upon 265 nm excitation, a broad emission band spanned from 300 nm to 500 nm and centered at 370 nm was observed. In addition, the effects of flux and charge compensation to photoluminescence properties of CAZO:Ti4+ were systematically investigated. The results show that 103% improvement of emission intensity was achieved when 1% H3BO3 flux was introduced and 32.8% enhancement of it for 2% Ca2+ vacancies doped as charge compensator. Moreover, the lifetimes, band gap energy, concentration quenching mechanism, as well as electron transition process of CAZO:Ti4+ were discussed. Due to the efficient broad bluish violet emission, this phosphor may find a potential application in mercury vapor‐excited fluorescent lamp for plant growth.

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Thermometry of red nanoflaked SrAl12O19:Mn4+ synthesized with boric acid flux

Cited by 28 publications

References 41 publications

None‐rare‐earth activated Ca₁₄Al₁₀Zn₆O₃₅:Bi³⁺,Mn⁴⁺ phosphor involving dual luminescent centers for temperature sensing

None‐rare‐earth activated Ca₁₄Al₁₀Zn₆O₃₅:Bi³⁺,Mn⁴⁺ phosphor involving dual luminescent centers for temperature sensing

Realization of an Optical Thermometer via Structural Confinement and Energy Transfer

Exploration of bluish violet‐emitting phosphor Ca₃Al₄ZnO₁₀:Ti⁴⁺ with enhanced emission by Ca²⁺ vacancies

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Thermometry of red nanoflaked SrAl12O19:Mn4+ synthesized with boric acid flux

Cited by 28 publications

References 41 publications

None‐rare‐earth activated Ca14Al10Zn6O35:Bi3+,Mn4+ phosphor involving dual luminescent centers for temperature sensing

None‐rare‐earth activated Ca14Al10Zn6O35:Bi3+,Mn4+ phosphor involving dual luminescent centers for temperature sensing

Realization of an Optical Thermometer via Structural Confinement and Energy Transfer

Exploration of bluish violet‐emitting phosphor Ca3Al4ZnO10:Ti4+ with enhanced emission by Ca2+ vacancies

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None‐rare‐earth activated Ca₁₄Al₁₀Zn₆O₃₅:Bi³⁺,Mn⁴⁺ phosphor involving dual luminescent centers for temperature sensing

None‐rare‐earth activated Ca₁₄Al₁₀Zn₆O₃₅:Bi³⁺,Mn⁴⁺ phosphor involving dual luminescent centers for temperature sensing

Exploration of bluish violet‐emitting phosphor Ca₃Al₄ZnO₁₀:Ti⁴⁺ with enhanced emission by Ca²⁺ vacancies