Zero-thermal-quenching of LiAl5O8: Eu2+, Mn2+ phosphors by energy transfer and defects engineering

Liu, Daiyuan; Wang, Ting; Liu, Yichun; Wang, Chao; Liu, Zhichao; Zhu, Xiaodie; Liu, Ya; Zhang, Jian; Teng, Zhaowei; Zhong, Yi; Yakovlev, Alexey N.; Xu, Xuhui

doi:10.1016/j.ceramint.2022.11.207

Cited by 13 publications

(5 citation statements)

References 27 publications

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“…High-power white-light LED (wLED) lighting is a crucial challenge due to the significant TQ at a high flux operating current. − In case that pc-WLED operates under high flux current, the Joule heat generated during LED operation increases the probability of nonradiative transition from the excited state to the ground state of the phosphor, which seriously weakens luminance efficiency and alters the stable white-light emission of the pc-WLEDs. Considering the controllable TQ effect in the wide temperature range, we fabricated the wLED devices by incorporating 1 and 2 as color-converted phosphors on a UV chip (λ max = 365 nm), and their luminescence spectra were investigated under the high bias current (SI, Tables S7 and S8).…”

Section: Resultsmentioning

confidence: 99%

Suppressing the Thermal Quenching Effect via a Cluster Conformer in Copper(I)–Iodide Coordination Polymeric Phosphors for High-Power White LED Lighting

Wang,

Fu,

Shen

et al. 2024

Inorg. Chem.

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High-power LED lighting is a crucial challenge due to the notorious thermal quenching (TQ) effect of traditional phosphors at high operating currents, which would result in poor device performance and hamper practical optoelectronic application. Herein, we demonstrate ligand engineering of a cubaneversus staircase-like [Cu 4 I 4 ] conformer as a node in coordination polymers, which remarkably suppresses the TQ effect of clusterbased photoluminescence. For complex 1 (the formula [Cu 4 I 4 (bbimb) 2 ] n ) with the cubane-like [Cu 4 I 4 ] conformer as a node, the metallophilicity interaction enables ultrabright triplet emission with a photoluminescence quantum yield over 82%, and the phonon-assisted detrapping process of excitons effectively suppresses the TQ effect in the wide temperature range. In contrast, the staircase-like [Cu 4 I 4 ] conformer as a node in complex 2 (the formula [Cu 4 I 4 (bbtmb) 2 ] n ) exhibits a serious TQ effect over the investigated temperature. Phosphor-converted white LEDs (pc-wLEDs) were fabricated by integrating the cluster-based coordination polymers as a color converter, and their electroluminescence performances were investigated under high bias currents. The prototype pc-wLED device by incorporating the phosphor with the suppressed TQ effect exhibits a continuous rise in brightness under a high bias current of 300 mA. The results demonstrate that ligand engineering of the cluster conformer via suppressing the TQ effect proves efficient in designing an ideal color converter for high-power pc-wLED lighting.

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Section: Resultsmentioning

confidence: 99%

Suppressing the Thermal Quenching Effect via a Cluster Conformer in Copper(I)–Iodide Coordination Polymeric Phosphors for High-Power White LED Lighting

Wang,

Fu,

Shen

et al. 2024

Inorg. Chem.

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“…These shallow traps are the reason for the efficient ET to the Sm 3+ emission band. Also, it is believed that the population of higher vibrational energy compensated for the intrinsic thermal quenching effect, and there was an increase in the emission intensity [57][58][59][60]. After 383 K, a decrease in the intensity arose from the fact that the nonradiative transition became dominant at high temperatures.…”

Section: Thermal Stability and Temperature-dependent Ple Propertiesmentioning

confidence: 99%

Demystification of luminescence properties and the near imperceptible thermal quenching of Sm³⁺‐doped tungstate phosphors

R.,

A.,

Kennedy

et al. 2024

Luminescence

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Ultra‐high thermally stable Ca2MgWO6:xSm3+ (x = 0.5, 0.75, 1, 1.25, and 1.5 mol%) double perovskite phosphors were synthesized through solid‐state reaction method. Product formation was confirmed by comparing the X‐ray diffraction (XRD) patterns of the phosphors with the standard reference file. The structural, morphological, thermal, and optical properties of the prepared phosphor were examined in detail using XRD, Fourier transform infrared spectra, scanning electron microscopy, diffused reflectance spectra, thermogravimetric analysis (TGA), photoluminescence emission, and temperature‐dependent PLE (TDPL). It was seen that the phosphor exhibited emission in the reddish region for the near‐ultraviolet excitation with moderate Colour Rendering Index values and high colour purity. The optimized phosphor (x = 1.25 mol%) was found to possess a direct optical band gap of 3.31 eV. TGA studies showed the astonishing thermal stability of the optimized phosphor. Additionally, near‐zero thermal quenching was seen in TDPL due to elevated phonon‐assisted radiative transition. Furthermore, the anti‐Stokes and Stokes emission peaks were found to be sensitive toward the temperature change and followed a Boltzmann‐type distribution. All these marked properties will make the prepared phosphors a suitable candidate for multifield applications and a fascinating material for further development.

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“…In some papers, NTQ has been termed as abnormal thermal quenching, zero thermal quenching [1][2][3], anti-thermal quenching [4], etc. NTQ has been reportedly observed in a wide variety of phosphors, such as those singly doped with rare earth ions , transition metal ions [23][24][25][26][27][28][29][30][31][32][33][34][35][36], ns 2 ions (Bi 3+ ) [37]; those doubly doped and triply doped with rare earth and transition metal ions [38][39][40][41][42], liquid-crystalline molecules and undoped metal halide [43,44]; as well as in up-conversion phosphor [45,46]. In these papers, the degree of NTQ, that is, the magnitude of the emission spectral intensity enhancement in the phosphor at high temperatures compared to the value at low temperature, ranges from 0.3% [10] to 34,700% [28].…”

Section: Introductionmentioning

confidence: 99%

Negative Thermal Quenching of Photoluminescence: An Evaluation from the Macroscopic Viewpoint

Yan

2024

Materials

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Negative thermal quenching (NTQ) denotes that the integral emission spectral intensity of a given phosphor increases continuously with increasing temperature up to a certain elevated temperature. NTQ has been the subject of intensive investigations in recent years, and a large number of phosphors are reported to have exhibited NTQ. In this paper, a collection of results in the archival literature about NTQ of specific phosphors is discussed from a macroscopic viewpoint, focusing on the following three aspects: (1) Could the NTQ of a given phosphor be reproducible? (2) Could the associated data for a given phosphor exhibiting NTQ be in line with the law of the conservation of energy? (3) Could the NTQ of a given phosphor be demonstrated in a prototype WLED device? By analyzing typical cases based on common sense, we hope to increase awareness of the issues with papers reporting the NTQ of specific phosphors based on spectral intensity, along with the importance of maintaining stable and consistent measurement conditions in temperature-dependent spectral intensity measurement, which is a prerequisite for the validity of the measurement results.

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Zero-thermal-quenching of LiAl5O8: Eu2+, Mn2+ phosphors by energy transfer and defects engineering

Cited by 13 publications

References 27 publications

Suppressing the Thermal Quenching Effect via a Cluster Conformer in Copper(I)–Iodide Coordination Polymeric Phosphors for High-Power White LED Lighting

Suppressing the Thermal Quenching Effect via a Cluster Conformer in Copper(I)–Iodide Coordination Polymeric Phosphors for High-Power White LED Lighting

Demystification of luminescence properties and the near imperceptible thermal quenching of Sm³⁺‐doped tungstate phosphors

Negative Thermal Quenching of Photoluminescence: An Evaluation from the Macroscopic Viewpoint

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Zero-thermal-quenching of LiAl5O8: Eu2+, Mn2+ phosphors by energy transfer and defects engineering

Cited by 13 publications

References 27 publications

Suppressing the Thermal Quenching Effect via a Cluster Conformer in Copper(I)–Iodide Coordination Polymeric Phosphors for High-Power White LED Lighting

Suppressing the Thermal Quenching Effect via a Cluster Conformer in Copper(I)–Iodide Coordination Polymeric Phosphors for High-Power White LED Lighting

Demystification of luminescence properties and the near imperceptible thermal quenching of Sm3+‐doped tungstate phosphors

Negative Thermal Quenching of Photoluminescence: An Evaluation from the Macroscopic Viewpoint

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Demystification of luminescence properties and the near imperceptible thermal quenching of Sm³⁺‐doped tungstate phosphors