On‐chip mercury‐free deep‐UV light‐emitting sources with ultrahigh germicidal efficiency
In the current COVID-19 scenario, there is an urgent need for developing efficient and mercury-free deep-ultraviolet (deep-UV) light sources for disinfection applications. AlGaN-based light-emitting diodes (LEDs) may be considered as an alternative, but due to their inherent low efficiencies in...
| Main Authors: | , , , , , , , |
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| Other Authors: | |
| Format: | Journal Article |
| Language: | English |
| Published: |
2021
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| Subjects: | |
| Online Access: | https://hdl.handle.net/10356/148901 |
| _version_ | 1811693866961600512 |
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| author | Sharma, Vijay Kumar Tan, Swee Tiam Zheng, Haiyang Shendre, Sushant Baum, Alexandra Chalvet, Francis Tirén, Jonas Demir, Hilmi Volkan |
| author2 | School of Electrical and Electronic Engineering |
| author_facet | School of Electrical and Electronic Engineering Sharma, Vijay Kumar Tan, Swee Tiam Zheng, Haiyang Shendre, Sushant Baum, Alexandra Chalvet, Francis Tirén, Jonas Demir, Hilmi Volkan |
| author_sort | Sharma, Vijay Kumar |
| collection | NTU |
| description | In the current COVID-19 scenario, there is an urgent need for developing
efficient and mercury-free deep-ultraviolet (deep-UV) light sources for
disinfection applications. AlGaN-based light-emitting diodes (LEDs) may
be considered as an alternative, but due to their inherent low efficiencies
in the deep-UV spectral region, significant developments are required to
address efficiency issues. Here, a mercury-free chip-size deep-UV light
source is shown which is enabled by high-vacuum chip-scale cavity sealing
overcoming the limitations of both mercury lamps and deep-UV LEDs.
These deep-UV chips are cathodoluminescence based, in which a cavity
is created with high vacuum integrity for efficient field-emission. These
chips demonstrate optical output power ≥20 mW (efficiency ≈4%) and,
owing to the spectral overlap of phosphor cathodoluminescence spectra
and germicidal effectiveness curve, resulted in log 6 (99.9999%) germicidal
efficiency. Additionally, these chips offer high reliability, “instant” ON/OFF
capability, high operational lifetimes, and low-temperature dependence
with complete design freedom. |
| first_indexed | 2024-10-01T06:58:30Z |
| format | Journal Article |
| id | ntu-10356/148901 |
| institution | Nanyang Technological University |
| language | English |
| last_indexed | 2024-10-01T06:58:30Z |
| publishDate | 2021 |
| record_format | dspace |
| spelling | ntu-10356/1489012023-02-28T20:02:31Z On‐chip mercury‐free deep‐UV light‐emitting sources with ultrahigh germicidal efficiency Sharma, Vijay Kumar Tan, Swee Tiam Zheng, Haiyang Shendre, Sushant Baum, Alexandra Chalvet, Francis Tirén, Jonas Demir, Hilmi Volkan School of Electrical and Electronic Engineering School of Physical and Mathematical Sciences LUMINOUS! Centre of Excellence for Semiconductor Lighting & Displays Engineering::Electrical and electronic engineering Science::Physics Cathodoluminescence Deep-ultraviolet Chips Disinfection Applications In the current COVID-19 scenario, there is an urgent need for developing efficient and mercury-free deep-ultraviolet (deep-UV) light sources for disinfection applications. AlGaN-based light-emitting diodes (LEDs) may be considered as an alternative, but due to their inherent low efficiencies in the deep-UV spectral region, significant developments are required to address efficiency issues. Here, a mercury-free chip-size deep-UV light source is shown which is enabled by high-vacuum chip-scale cavity sealing overcoming the limitations of both mercury lamps and deep-UV LEDs. These deep-UV chips are cathodoluminescence based, in which a cavity is created with high vacuum integrity for efficient field-emission. These chips demonstrate optical output power ≥20 mW (efficiency ≈4%) and, owing to the spectral overlap of phosphor cathodoluminescence spectra and germicidal effectiveness curve, resulted in log 6 (99.9999%) germicidal efficiency. Additionally, these chips offer high reliability, “instant” ON/OFF capability, high operational lifetimes, and low-temperature dependence with complete design freedom. Accepted version 2021-08-12T02:54:34Z 2021-08-12T02:54:34Z 2021 Journal Article Sharma, V. K., Tan, S. T., Zheng, H., Shendre, S., Baum, A., Chalvet, F., Tirén, J. & Demir, H. V. (2021). On‐chip mercury‐free deep‐UV light‐emitting sources with ultrahigh germicidal efficiency. Advanced Optical Materials, 9(15), 2100072-. https://dx.doi.org/10.1002/adom.202100072 2195-1071 https://hdl.handle.net/10356/148901 10.1002/adom.202100072 15 9 2100072 en Advanced Optical Materials This is the peer reviewed version of the following article: Sharma, V. K., Tan, S. T., Zheng, H., Shendre, S., Baum, A., Chalvet, F., Tirén, J. & Demir, H. V. (2021). On‐chip mercury‐free deep‐UV light‐emitting sources with ultrahigh germicidal efficiency. Advanced Optical Materials, 9(15), 2100072-, which has been published in final form at https://dx.doi.org/10.1002/adom.202100072. This article may be used for non-commercial purposes in accordance with Wiley Terms and Conditions for Use of Self-Archived Versions. application/pdf |
| spellingShingle | Engineering::Electrical and electronic engineering Science::Physics Cathodoluminescence Deep-ultraviolet Chips Disinfection Applications Sharma, Vijay Kumar Tan, Swee Tiam Zheng, Haiyang Shendre, Sushant Baum, Alexandra Chalvet, Francis Tirén, Jonas Demir, Hilmi Volkan On‐chip mercury‐free deep‐UV light‐emitting sources with ultrahigh germicidal efficiency |
| title | On‐chip mercury‐free deep‐UV light‐emitting sources with ultrahigh germicidal efficiency |
| title_full | On‐chip mercury‐free deep‐UV light‐emitting sources with ultrahigh germicidal efficiency |
| title_fullStr | On‐chip mercury‐free deep‐UV light‐emitting sources with ultrahigh germicidal efficiency |
| title_full_unstemmed | On‐chip mercury‐free deep‐UV light‐emitting sources with ultrahigh germicidal efficiency |
| title_short | On‐chip mercury‐free deep‐UV light‐emitting sources with ultrahigh germicidal efficiency |
| title_sort | on chip mercury free deep uv light emitting sources with ultrahigh germicidal efficiency |
| topic | Engineering::Electrical and electronic engineering Science::Physics Cathodoluminescence Deep-ultraviolet Chips Disinfection Applications |
| url | https://hdl.handle.net/10356/148901 |
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