The transmission modulation effect of patterns on the light extraction of ultraviolet-C light emitting diodes
The AlGaN-based ultraviolet-C light emitting diodes (UVC LEDs) exhibit low light extraction efficiency (LEE), and patterning substrate surfaces is considered an effective solution. In this work, a simplified model based on the light extraction process of typical flip-chip UVC LEDs is proposed, which...
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| Format: | Article |
| Language: | English |
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AIP Publishing LLC
2024-12-01
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| Series: | AIP Advances |
| Online Access: | http://dx.doi.org/10.1063/5.0235281 |
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| author | Yucheng Tian Hui Wang Huimin Lu Zhizhong Chen Tongjun Yu |
| author_facet | Yucheng Tian Hui Wang Huimin Lu Zhizhong Chen Tongjun Yu |
| author_sort | Yucheng Tian |
| collection | DOAJ |
| description | The AlGaN-based ultraviolet-C light emitting diodes (UVC LEDs) exhibit low light extraction efficiency (LEE), and patterning substrate surfaces is considered an effective solution. In this work, a simplified model based on the light extraction process of typical flip-chip UVC LEDs is proposed, which accelerates the simulations and illustrates the transmission process of patterned substrates more clearly. It is found that, different from the case in InGaN-based visible LEDs, the patterns on the substrate surfaces of UVC LEDs enhance the LEE by modulating the transmittance. The effects of sub-micron patterns are also studied, and the results suggest that the effects of LEE enhancement from different-scaled patterns vary little, unless the scale is decreased below a certain threshold so that the LEE decreases significantly. The results also show that AlN substrates can exhibit a 33% relative LEE enhancement if properly patterned, in contrast to the 18% enhancement in the case of sapphire. The proposed models and the acquired conclusions should be of help in designing UVC LEDs with high efficiency, especially for those on AlN substrates. |
| format | Article |
| id | doaj-art-b6c44d93a2734766ab91b29275a5fdea |
| institution | Kabale University |
| issn | 2158-3226 |
| language | English |
| publishDate | 2024-12-01 |
| publisher | AIP Publishing LLC |
| record_format | Article |
| series | AIP Advances |
| spelling | doaj-art-b6c44d93a2734766ab91b29275a5fdea2025-01-02T17:23:44ZengAIP Publishing LLCAIP Advances2158-32262024-12-011412125202125202-910.1063/5.0235281The transmission modulation effect of patterns on the light extraction of ultraviolet-C light emitting diodesYucheng Tian0Hui Wang1Huimin Lu2Zhizhong Chen3Tongjun Yu4State Key Laboratory for Artificial Microstructures and Mesoscopic Physics, School of Physics, Peking University, Beijing 100871, People’s Republic of ChinaState Key Laboratory for Artificial Microstructures and Mesoscopic Physics, School of Physics, Peking University, Beijing 100871, People’s Republic of ChinaThe School of Computer and Communication Engineering, University of Science and Technology Beijing, Beijing 100089, ChinaState Key Laboratory for Artificial Microstructures and Mesoscopic Physics, School of Physics, Peking University, Beijing 100871, People’s Republic of ChinaState Key Laboratory for Artificial Microstructures and Mesoscopic Physics, School of Physics, Peking University, Beijing 100871, People’s Republic of ChinaThe AlGaN-based ultraviolet-C light emitting diodes (UVC LEDs) exhibit low light extraction efficiency (LEE), and patterning substrate surfaces is considered an effective solution. In this work, a simplified model based on the light extraction process of typical flip-chip UVC LEDs is proposed, which accelerates the simulations and illustrates the transmission process of patterned substrates more clearly. It is found that, different from the case in InGaN-based visible LEDs, the patterns on the substrate surfaces of UVC LEDs enhance the LEE by modulating the transmittance. The effects of sub-micron patterns are also studied, and the results suggest that the effects of LEE enhancement from different-scaled patterns vary little, unless the scale is decreased below a certain threshold so that the LEE decreases significantly. The results also show that AlN substrates can exhibit a 33% relative LEE enhancement if properly patterned, in contrast to the 18% enhancement in the case of sapphire. The proposed models and the acquired conclusions should be of help in designing UVC LEDs with high efficiency, especially for those on AlN substrates.http://dx.doi.org/10.1063/5.0235281 |
| spellingShingle | Yucheng Tian Hui Wang Huimin Lu Zhizhong Chen Tongjun Yu The transmission modulation effect of patterns on the light extraction of ultraviolet-C light emitting diodes AIP Advances |
| title | The transmission modulation effect of patterns on the light extraction of ultraviolet-C light emitting diodes |
| title_full | The transmission modulation effect of patterns on the light extraction of ultraviolet-C light emitting diodes |
| title_fullStr | The transmission modulation effect of patterns on the light extraction of ultraviolet-C light emitting diodes |
| title_full_unstemmed | The transmission modulation effect of patterns on the light extraction of ultraviolet-C light emitting diodes |
| title_short | The transmission modulation effect of patterns on the light extraction of ultraviolet-C light emitting diodes |
| title_sort | transmission modulation effect of patterns on the light extraction of ultraviolet c light emitting diodes |
| url | http://dx.doi.org/10.1063/5.0235281 |
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