Nanopatterned sapphire substrate to enhance the efficiency of AlGaN-based UVC light source tube with CNT electron-beam
| Autor: | Wael Z. Tawfik, Sang Kyun Shim, Shangfeng Liu, Naesung Lee, Xinqiang Wang, C. M. Manoj Kumar, June Key Lee |
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| Rok vydání: | 2020 |
| Předmět: |
010302 applied physics
Materials science business.industry Heterojunction Cathodoluminescence 02 engineering and technology General Chemistry 021001 nanoscience & nanotechnology 01 natural sciences law.invention Anode Triode law 0103 physical sciences Materials Chemistry Cathode ray Optoelectronics Light emission 0210 nano-technology business Layer (electronics) Electron gun |
| Zdroj: | Journal of Materials Chemistry C. 8:17336-17341 |
| ISSN: | 2050-7534 2050-7526 |
| DOI: | 10.1039/d0tc04597g |
| Popis: | The short wavelength of far ultraviolet C (UVC) light sources is effective for various applications that include sterilizing bacteria and viruses, water purification, and sensing. Here, a triode structure UVC light source tube operating at ∼270 nm using a carbon nanotube (CNT) electron emitter as an excitation source is achieved to overcome the known issues with a conventional UVC-LED. The cathodoluminescence (CL) layer-based AlGaN MQW heterostructure is evaluated for UVC light emission. For comparison, the AlGaN-based MQW heterostructure was grown on a conventional sapphire substrate (CSS) and a nanopatterned sapphire substrate (NPSS). The NPSS efficiently enhanced the emission efficiency of UVC light, compared to that grown on a CSS. The output power of the UVC light source tube with AlGaN MQWs grown on NPSS was 2.33 times higher than that grown on CSS. Correspondingly, a high-power efficiency of 1.87% was demonstrated through a 2 inch light-emitting area with a low consumption energy of 18 W (anode voltage 9 kV; anode current 2 mA). |
| Databáze: | OpenAIRE |
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