Cation sites modification enhanced luminescence and thermal quenching characteristic in the blue light-emitting Na3Sc2-xZnx(PO4)3:0.03Eu2+ phosphors

Xian, Yulun; Li, Junhao; Wen, Dawei; Xie, Feiyan; Xu, Yiqin; Xu, Ping; Zhang, Qiang; Chen, Zhitao; Yan, Jing

doi:10.1016/j.jlumin.2020.117615

Cited by 8 publications

(25 citation statements)

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“…However, the introduction of Sm 3+ causes obvious deviation from linearity. We deem that the coexistence of Tb–Tb and Tb–Sm energy transfers is possible to induce the nonlinearity for the decay curves of Tb 3+ luminescence, and thus, the second-order exponential function is applied to fit the other decay curves. , The obtained fitting R -squares indicate that the fitting results are overall satisfactory, and all the fitting parameters are provided in Table S3. Quantization on the efficiency of Tb 3+ –Sm 3+ energy transfer can be obtained using the following formula , where τ and τ 0 correspond to the fluorescence lifetimes of Tb 3+ in the absence and presence of Sm 3+ .…”

Section: Resultsmentioning

confidence: 91%

“…2 is applied to fit the other decay curves. 18,19 The obtained fitting R-squares indicate that the fitting results are overall satisfactory, and all the fitting parameters are provided in Table S3. Quantization on the efficiency of Tb 3+ −Sm 3+ energy transfer can be obtained using the following formula 20,21…”

Section: Pl Properties and Energy Transfer Of Ctsao:xsm 3+mentioning

confidence: 80%

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Enlarging Sensitivity of Fluorescence Intensity Ratio-Type Thermometers by the Interruption of the Energy Transfer from a Sensitizer to an Activator

et al. 2022

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The occurrence of energy transfer (ET) would enhance the luminescence of the activator but sacrifice that of the sensitizer. However, the novel Sm3+-doped Ca2TbSn2Al3O12 (CTSAO) phosphor reported here seems to be an exception. In the series of CTSAO:xSm3+ phosphors investigated, something unexpected occurs; the activator, Sm3+, did not gain any energy compensation from the sensitizer, Tb3+, when temperature increases. Instead, when the loss of Sm3+ luminescence accelerates, simultaneously, the loss of Tb3+ luminescence accordingly alleviates. By careful calculations on the ET efficiency of the CTSAO:0.06Sm3+ phosphor at different temperatures, it is surprisingly found that the efficiency keeps decreasing as temperature increases. It means that the Tb3+–Sm3+ energy transfer is capable of being interrupted by an increasing temperature. By simulation, it is found that the occurrence of thermal interruption of energy transfer benefits the achievement of a higher temperature sensing sensitivity. In this sense, making use of the thermal interruption of energy transfer could become a novel route for further design of the fluorescence intensity ratio-type luminescence thermometers.

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Section: Resultsmentioning

confidence: 91%

Section: Pl Properties and Energy Transfer Of Ctsao:xsm 3+mentioning

confidence: 80%

Enlarging Sensitivity of Fluorescence Intensity Ratio-Type Thermometers by the Interruption of the Energy Transfer from a Sensitizer to an Activator

et al. 2022

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“…36,37,[40][41][42] The PL spectra of Eu 3+ -doped CNYP-I (0 ≤ x ≤ 1/2) and CNYP-II (0 ≤ y ≤ 1) compounds under 395 nm excitation show several sharp peaks, corresponding to 5 D 0 -7 F 0 (578 nm), 5 D 0 -7 F 1 (590 nm), 5 D 0 -7 F 2 (612 nm), 5 D 0 -7 F 3 (652 nm), and 5 D 0 -7 F 4 (698 nm) Eu 3+ transitions, respectively (shown in Figure 5B). [43][44][45][46][47] Figure 5C depicts the diagram of energy level related to Eu 3+ ions. The transition of excited Eu 3+ electrons from the 7F ground-state to the 5D, 5L, and 5H excited-states occurred.…”

Section: Photoluminescence Propertiesmentioning

confidence: 99%

The composition engineering of red‐emitting Eu³⁺‐doped Ca_10.5(PO₄)₇‐type solid solution phosphors and application in LED

Wang

Huang

et al. 2021

J. Am. Ceram. Soc.

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In this work, using Ca 10.5 (PO 4 ) 7 as the structural model, a number of Eu 3+ -doped [Ca 9 Na 3x Y 1-x (PO 4 ) 7 (CNYP-I, 0 ≤ x ≤ 1/2) ← Ca 10.5 (PO 4 ) 7 → Ca 9+y Na 3/2-y/2 Y (1-y)/2 (PO 4 ) 7 (CNYP-II, 0 ≤ y ≤ 1)] phosphors were designed and synthesized through the heterovalent substitution of Y 3+ and Na + to Ca 2+ . The substitution mechanism, composition structure, luminescence performance, and thermal stability of Eu 3+ -doped CNYP-I (0 ≤ x ≤ 1/2) as well as the solid solutions of CNYP-II (0 ≤ y ≤ 1), were discussed in detail. The morphology and element composition of CNYP-I (0 ≤ x ≤ 1/2) and CNYP-II (0 ≤ y ≤ 1) solid solutions were analyzed by SEM and EDS. The PL spectra of the specimens were containing the predominant red peak of emission at 612 nm caused via the transition of 5 D 0 -7 F 2 , indicating that Eu 3+ occupies the low-symmetry center. Moreover, the site symmetry Eu 3+ occupied changed with the x/y value. The luminous intensity of Eu 3+ -doped CNYP-I (0 ≤ x ≤ 1/2) and CNYP-II (0 ≤ y ≤ 1) phosphors at 150°C maintained about 60% of room temperature. The representative compound CNYP-I (x = 1/3) was used as the red phosphor to prepare a near-UV based white LEDs along with Ra of 80.9 and CCT of 4100 K.

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“…The higher the concentration of defects introduced in a phosphor lattice, the larger the emission intensity enhancement at elevated temperatures, and the better thermal stability of the given phosphor. 53,57,58,67,70,[73][74][75] In this contribution, defect-induced ZTQ and NTQ phenomena of Eu 2+ -doped phosphors are overviewed. The NTQ and/or ZTQ phenomena of Eu 2+ luminescence were observed largely in some phosphate, fluorophosphate, fluoroborate, silicate, chlorosilicate, and oxynitride lattices.…”

mentioning

confidence: 99%

“…Depending on the concentration of defects in the lattice, degree of NTQ could be tuned. 53,57,58,67,70,[73][74][75] Although the above explanations for ZTQ and/or NTQ of Eu 2+ -doped phosphors seemed plausible in the specific papers and were widely adopted in the literature, a close examination of the literature data about temperature dependences of the absorption fraction of the excitation light, emission intensity, QE and lifetime for the relevant Eu 2+ -doped phosphors indicates that it is debatable whether NTQ could be an intrinsic property of the benchmark blue emitting phosphor Na 3 Sc 2 (PO 4 ) 3 : Eu 2+ , and whether the ascription of NTQ for the Eu 2+ -doped phosphors to energy transfer from the defects to the Eu 2+ 5d levels is sound and trustworthy.…”

mentioning

confidence: 99%

On The Validity of the Defect- Induced Negative Thermal Quenching of Eu²⁺-Doped Phosphors

Yan¹

2023

ECS J. Solid State Sci. Technol.

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In this paper, defect-induced negative thermal quenching (NTQ) of Eu2+-doped phosphors is overviewed. NTQ denotes that the integrated emission intensity of a given phosphor increases continuously with increasing temperature up to a certain elevated temperature. The NTQ phenomenon of Eu2+ luminescence was reportedly observed in a broad variety of lattices. The NTQ of these Eu2+-doped phosphors was generally ascribed to thermally stimulated detrapping of the excitation light stored in defects (traps) and subsequent energy transfer from the defects to the Eu2+ 5d levels. Validity of defect- induced NTQ of Eu2+-doped phosphors is assessed and factors that may contribute to the measured emission intensity of a given phosphor at elevated temperatures are discussed. It is suggested that it is debatable whether NTQ could be an intrinsic property of the blue-emitting phosphor Na3Sc2(PO4)3: Eu2+, and whether the emission intensity enhancement with increasing temperature for Eu2+-doped phosphors could be related to energy transfer from defects. The temperature dependence of the measured emission intensity alone seems not to be a good measure for evaluating TQ property of a phosphor, since it is affected by not only the quantum efficiency of a phosphor but also some extrinsic factors at elevated temperatures.

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Cation sites modification enhanced luminescence and thermal quenching characteristic in the blue light-emitting Na3Sc2-xZnx(PO4)3:0.03Eu2+ phosphors

Cited by 8 publications

References 35 publications

Enlarging Sensitivity of Fluorescence Intensity Ratio-Type Thermometers by the Interruption of the Energy Transfer from a Sensitizer to an Activator

Enlarging Sensitivity of Fluorescence Intensity Ratio-Type Thermometers by the Interruption of the Energy Transfer from a Sensitizer to an Activator

The composition engineering of red‐emitting Eu³⁺‐doped Ca_10.5(PO₄)₇‐type solid solution phosphors and application in LED

On The Validity of the Defect- Induced Negative Thermal Quenching of Eu²⁺-Doped Phosphors

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Cation sites modification enhanced luminescence and thermal quenching characteristic in the blue light-emitting Na3Sc2-xZnx(PO4)3:0.03Eu2+ phosphors

Cited by 8 publications

References 35 publications

Enlarging Sensitivity of Fluorescence Intensity Ratio-Type Thermometers by the Interruption of the Energy Transfer from a Sensitizer to an Activator

Enlarging Sensitivity of Fluorescence Intensity Ratio-Type Thermometers by the Interruption of the Energy Transfer from a Sensitizer to an Activator

The composition engineering of red‐emitting Eu3+‐doped Ca10.5(PO4)7‐type solid solution phosphors and application in LED

On The Validity of the Defect- Induced Negative Thermal Quenching of Eu2+-Doped Phosphors

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The composition engineering of red‐emitting Eu³⁺‐doped Ca_10.5(PO₄)₇‐type solid solution phosphors and application in LED

On The Validity of the Defect- Induced Negative Thermal Quenching of Eu²⁺-Doped Phosphors