Photoluminescence Properties of Cyan-Emitting Lu<sub>3</sub>Ga<sub>x</sub>Al<sub>5−x</sub>O<sub>12</sub>: Ce<sup>3+</sup> Garnet Phosphors Synthesized in Nonreducing Atmosphere and at Different Temperature for High Quality w-LEDs
The existence of so-called blue-green cavities in the luminescence spectrum has been a hindrance to the improvement in the performance of traditional phosphor-converted white light emitting diodes. The commercial phosphors synthesized in reducing atmospheres can also cause problems such as equipment...
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MDPI AG
2022-09-01
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| Online Access: | https://www.mdpi.com/1996-1944/15/19/6817 |
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| author | Ming-Yang Qu Ting-Qu Li Qiao-Li Liu |
| author_facet | Ming-Yang Qu Ting-Qu Li Qiao-Li Liu |
| author_sort | Ming-Yang Qu |
| collection | DOAJ |
| description | The existence of so-called blue-green cavities in the luminescence spectrum has been a hindrance to the improvement in the performance of traditional phosphor-converted white light emitting diodes. The commercial phosphors synthesized in reducing atmospheres can also cause problems such as equipment complexity, increased cost, and environmental pollution. Herein, a series of cyan-emitting Lu<sub>3</sub>Ga<sub>x</sub>Al<sub>5−x</sub>O<sub>12</sub>: Ce<sup>3+</sup> (x = 0, 1, 2, 3, 4) garnet phosphors were synthesized by a traditional solid-state reaction in a nonreducing atmosphere at different temperatures. The crystal structure, grain morphology, optical properties, and thermal quenching behavior were used to analyze the optical properties of the as-prepared phosphors. The luminescence intensity of samples is affected by the synthesis temperature and energy gap between the conduction band and the lowest energy of the 5d excited state of the host lattice. With the substitution of Al<sup>3+</sup> by Ga<sup>3+</sup>, the regularity of the excitation and emission band movement is determined by the combined effects of crystal field splitting (CFS) and the nephelauxetic effect (NE). The temperature dependence of luminescence was studied. The thermal quenching mechanism was clarified by the thermal ionization model. Finally, by employing Lu<sub>2.94</sub>Ga<sub>2</sub>Al<sub>3</sub>O<sub>12</sub>: Ce<sup>3+</sup><sub>0.06</sub> as a cyan component, a w-LED with a high color rendering index of 93.2 and low correlation color temperature of 3880 K based on a blue chip and commercial red phosphors were fabricated in order to explore its possible application in high quality w-LED. |
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| language | English |
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| spelling | doaj.art-563e4c029be544ec9697d1bc6d92831f2023-11-23T20:57:14ZengMDPI AGMaterials1996-19442022-09-011519681710.3390/ma15196817Photoluminescence Properties of Cyan-Emitting Lu<sub>3</sub>Ga<sub>x</sub>Al<sub>5−x</sub>O<sub>12</sub>: Ce<sup>3+</sup> Garnet Phosphors Synthesized in Nonreducing Atmosphere and at Different Temperature for High Quality w-LEDsMing-Yang Qu0Ting-Qu Li1Qiao-Li Liu2Key Laboratory for Special Functional Materials in Jilin Provincial Universities, Jilin Institute of Chemical Technology, Jilin 132022, ChinaKey Laboratory for Special Functional Materials in Jilin Provincial Universities, Jilin Institute of Chemical Technology, Jilin 132022, ChinaKey Laboratory for Special Functional Materials in Jilin Provincial Universities, Jilin Institute of Chemical Technology, Jilin 132022, ChinaThe existence of so-called blue-green cavities in the luminescence spectrum has been a hindrance to the improvement in the performance of traditional phosphor-converted white light emitting diodes. The commercial phosphors synthesized in reducing atmospheres can also cause problems such as equipment complexity, increased cost, and environmental pollution. Herein, a series of cyan-emitting Lu<sub>3</sub>Ga<sub>x</sub>Al<sub>5−x</sub>O<sub>12</sub>: Ce<sup>3+</sup> (x = 0, 1, 2, 3, 4) garnet phosphors were synthesized by a traditional solid-state reaction in a nonreducing atmosphere at different temperatures. The crystal structure, grain morphology, optical properties, and thermal quenching behavior were used to analyze the optical properties of the as-prepared phosphors. The luminescence intensity of samples is affected by the synthesis temperature and energy gap between the conduction band and the lowest energy of the 5d excited state of the host lattice. With the substitution of Al<sup>3+</sup> by Ga<sup>3+</sup>, the regularity of the excitation and emission band movement is determined by the combined effects of crystal field splitting (CFS) and the nephelauxetic effect (NE). The temperature dependence of luminescence was studied. The thermal quenching mechanism was clarified by the thermal ionization model. Finally, by employing Lu<sub>2.94</sub>Ga<sub>2</sub>Al<sub>3</sub>O<sub>12</sub>: Ce<sup>3+</sup><sub>0.06</sub> as a cyan component, a w-LED with a high color rendering index of 93.2 and low correlation color temperature of 3880 K based on a blue chip and commercial red phosphors were fabricated in order to explore its possible application in high quality w-LED.https://www.mdpi.com/1996-1944/15/19/6817cyan phosphorphotoluminescenceband gapthermal ionization |
| spellingShingle | Ming-Yang Qu Ting-Qu Li Qiao-Li Liu Photoluminescence Properties of Cyan-Emitting Lu<sub>3</sub>Ga<sub>x</sub>Al<sub>5−x</sub>O<sub>12</sub>: Ce<sup>3+</sup> Garnet Phosphors Synthesized in Nonreducing Atmosphere and at Different Temperature for High Quality w-LEDs Materials cyan phosphor photoluminescence band gap thermal ionization |
| title | Photoluminescence Properties of Cyan-Emitting Lu<sub>3</sub>Ga<sub>x</sub>Al<sub>5−x</sub>O<sub>12</sub>: Ce<sup>3+</sup> Garnet Phosphors Synthesized in Nonreducing Atmosphere and at Different Temperature for High Quality w-LEDs |
| title_full | Photoluminescence Properties of Cyan-Emitting Lu<sub>3</sub>Ga<sub>x</sub>Al<sub>5−x</sub>O<sub>12</sub>: Ce<sup>3+</sup> Garnet Phosphors Synthesized in Nonreducing Atmosphere and at Different Temperature for High Quality w-LEDs |
| title_fullStr | Photoluminescence Properties of Cyan-Emitting Lu<sub>3</sub>Ga<sub>x</sub>Al<sub>5−x</sub>O<sub>12</sub>: Ce<sup>3+</sup> Garnet Phosphors Synthesized in Nonreducing Atmosphere and at Different Temperature for High Quality w-LEDs |
| title_full_unstemmed | Photoluminescence Properties of Cyan-Emitting Lu<sub>3</sub>Ga<sub>x</sub>Al<sub>5−x</sub>O<sub>12</sub>: Ce<sup>3+</sup> Garnet Phosphors Synthesized in Nonreducing Atmosphere and at Different Temperature for High Quality w-LEDs |
| title_short | Photoluminescence Properties of Cyan-Emitting Lu<sub>3</sub>Ga<sub>x</sub>Al<sub>5−x</sub>O<sub>12</sub>: Ce<sup>3+</sup> Garnet Phosphors Synthesized in Nonreducing Atmosphere and at Different Temperature for High Quality w-LEDs |
| title_sort | photoluminescence properties of cyan emitting lu sub 3 sub ga sub x sub al sub 5 x sub o sub 12 sub ce sup 3 sup garnet phosphors synthesized in nonreducing atmosphere and at different temperature for high quality w leds |
| topic | cyan phosphor photoluminescence band gap thermal ionization |
| url | https://www.mdpi.com/1996-1944/15/19/6817 |
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