Phonon Structure Engineering for Intrinsically Spectrally Selective Emitters by Anion Groups
Spectrally selective emitters (SSEs) have attracted considerable attention, because of radiative cooling, which could dissipate the heat from earth to outer space through the atmospheric window without any energy input. Intrinsically inorganic SSEs have significant advantages to other SSEs, such as...
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MDPI AG
2025-06-01
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| author | Rui Zhang Enhui Huang Wenying Zhong Bo Xu |
| author_facet | Rui Zhang Enhui Huang Wenying Zhong Bo Xu |
| author_sort | Rui Zhang |
| collection | DOAJ |
| description | Spectrally selective emitters (SSEs) have attracted considerable attention, because of radiative cooling, which could dissipate the heat from earth to outer space through the atmospheric window without any energy input. Intrinsically inorganic SSEs have significant advantages to other SSEs, such as the low fabrication cost due to the extremely simple structures and long life span under solar exposure. However, few inorganic materials can act as intrinsic SSEs due to the limited emissions in the atmospheric window. Here, we propose a strategy to design intrinsic SSEs by complementing the IR-active phonons in atmospheric window with anion groups. Accordingly, we demonstrate borates containing both [BO<sub>3</sub>]<sup>3−</sup> and [BO<sub>4</sub>]<sup>5−</sup> units can exhibit high emissivity within the whole atmospheric window, because the IR-active phonons of [BO<sub>3</sub>]<sup>3−</sup> units usually locate around 8 and 13 μm, while those of [BO<sub>4</sub>]<sup>5−</sup> units distribute in 9~11 μm. Furthermore, K<sub>3</sub>B<sub>6</sub>O<sub>10</sub>Cl and BaAlBO<sub>4</sub> are selected as two examples to display their near-unity emissivity (>95%) within the whole atmospheric window experimentally. These results not only offer a new strategy for the design of intrinsic SSEs, but also endow wide band-gap borates containing both [BO<sub>3</sub>]<sup>3−</sup> and [BO<sub>4</sub>]<sup>5−</sup> units with great potential applications for radiative cooling. |
| format | Article |
| id | doaj-art-b4d665ef69f24fc2bdc53834ff0689de |
| institution | OA Journals |
| issn | 2304-6732 |
| language | English |
| publishDate | 2025-06-01 |
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| spelling | doaj-art-b4d665ef69f24fc2bdc53834ff0689de2025-08-20T02:21:46ZengMDPI AGPhotonics2304-67322025-06-0112659710.3390/photonics12060597Phonon Structure Engineering for Intrinsically Spectrally Selective Emitters by Anion GroupsRui Zhang0Enhui Huang1Wenying Zhong2Bo Xu3Key Laboratory of Biomedical Functional Materials, School of Science, China Pharmaceutical University, Nanjing 211198, ChinaKey Laboratory of Biomedical Functional Materials, School of Science, China Pharmaceutical University, Nanjing 211198, ChinaKey Laboratory of Biomedical Functional Materials, School of Science, China Pharmaceutical University, Nanjing 211198, ChinaKey Laboratory of Biomedical Functional Materials, School of Science, China Pharmaceutical University, Nanjing 211198, ChinaSpectrally selective emitters (SSEs) have attracted considerable attention, because of radiative cooling, which could dissipate the heat from earth to outer space through the atmospheric window without any energy input. Intrinsically inorganic SSEs have significant advantages to other SSEs, such as the low fabrication cost due to the extremely simple structures and long life span under solar exposure. However, few inorganic materials can act as intrinsic SSEs due to the limited emissions in the atmospheric window. Here, we propose a strategy to design intrinsic SSEs by complementing the IR-active phonons in atmospheric window with anion groups. Accordingly, we demonstrate borates containing both [BO<sub>3</sub>]<sup>3−</sup> and [BO<sub>4</sub>]<sup>5−</sup> units can exhibit high emissivity within the whole atmospheric window, because the IR-active phonons of [BO<sub>3</sub>]<sup>3−</sup> units usually locate around 8 and 13 μm, while those of [BO<sub>4</sub>]<sup>5−</sup> units distribute in 9~11 μm. Furthermore, K<sub>3</sub>B<sub>6</sub>O<sub>10</sub>Cl and BaAlBO<sub>4</sub> are selected as two examples to display their near-unity emissivity (>95%) within the whole atmospheric window experimentally. These results not only offer a new strategy for the design of intrinsic SSEs, but also endow wide band-gap borates containing both [BO<sub>3</sub>]<sup>3−</sup> and [BO<sub>4</sub>]<sup>5−</sup> units with great potential applications for radiative cooling.https://www.mdpi.com/2304-6732/12/6/597spectrally selective emittersphonon structure engineeringradiative cooling |
| spellingShingle | Rui Zhang Enhui Huang Wenying Zhong Bo Xu Phonon Structure Engineering for Intrinsically Spectrally Selective Emitters by Anion Groups Photonics spectrally selective emitters phonon structure engineering radiative cooling |
| title | Phonon Structure Engineering for Intrinsically Spectrally Selective Emitters by Anion Groups |
| title_full | Phonon Structure Engineering for Intrinsically Spectrally Selective Emitters by Anion Groups |
| title_fullStr | Phonon Structure Engineering for Intrinsically Spectrally Selective Emitters by Anion Groups |
| title_full_unstemmed | Phonon Structure Engineering for Intrinsically Spectrally Selective Emitters by Anion Groups |
| title_short | Phonon Structure Engineering for Intrinsically Spectrally Selective Emitters by Anion Groups |
| title_sort | phonon structure engineering for intrinsically spectrally selective emitters by anion groups |
| topic | spectrally selective emitters phonon structure engineering radiative cooling |
| url | https://www.mdpi.com/2304-6732/12/6/597 |
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