Please use this identifier to cite or link to this item: https://hdl.handle.net/10356/148901
Title: On‐chip mercury‐free deep‐UV light‐emitting sources with ultrahigh germicidal efficiency
Authors: Sharma, Vijay Kumar
Tan, Swee Tiam
Zheng, Haiyang
Shendre, Sushant
Baum, Alexandra
Chalvet, Francis
Tirén, Jonas
Demir, Hilmi Volkan
Keywords: Engineering::Electrical and electronic engineering
Science::Physics
Issue Date: 2021
Source: 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
Journal: Advanced Optical Materials
Abstract: 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.
URI: https://hdl.handle.net/10356/148901
ISSN: 2195-1071
DOI: 10.1002/adom.202100072
Rights: 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.
Fulltext Permission: embargo_20220811
Fulltext Availability: With Fulltext
Appears in Collections:EEE Journal Articles
SPMS Journal Articles

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