Abstract
Deep ultraviolet light-emitting diodes (DUV LEDs) are promising light sources for disinfection, especially during the pandemic of novel coronavirus (COVID-19). Despite much effort in the development of DUV LEDs, the device temperature and ideality factor are key parameters of devices, which are often neglected. Here, we developed a simple and convenient method to study the behavior of a 280 nm AlGaN-based DUV LED, obtaining the electrical, optical, and thermal properties within one measurement. From the experimental results, we find that the light output power and wall-plug efficiency of the AlGaN-based DUV LED are strongly affected by device temperature, ideality factor (β), and series resistance (Rs). β decreases from 9.3 to 8.1 at 40 mA when the temperature increases from 302 to 317 K. We compared these results with simulations and found that the high potential barriers inside the device and the carrier concentration in n-type or p-type layers, especially the hole concentration in p-type layers, are the two key factors for the high value of the ideality factor from the LED structure. As the device temperature increases, carriers with higher energy would overcome some potential barriers and Mg acceptor activation would be more efficient, which are beneficial for carrier transportation. However, these also lead to the carrier overflow and weaken the radiative recombination rate. The trade-off role of device temperature in carriers between transportation and overflow is needed to be considered in the future development of DUV LEDs with higher efficiency and higher brightness.
Highlights
The outbreak of coronavirus disease 2019 (COVID-19) has undoubtedly threatened the public health and has an enormous impact on the global economy since the end of 2019.1,2 Precautions such as alcohol-based disinfectants,3 high-temperature sterilization,4 and deep ultraviolet (DUV) disinfection5 are advisable to limit the high transmission efficiency of COVID-19 through direct contact or airborne routes.6 In situations where alcohol-based disinfectants and high-temperature sterilization are not applicable, we could resort to DUV light sources from mercury lamps andAlGaN-based DUV light-emitting diodes (DUV LEDs)
We find that the light output power and wall-plug efficiency of the AlGaN-based DUV LED are strongly affected by device temperature, ideality factor (β), and series resistance (Rs). β decreases from 9.3 to 8.1 at 40 mA when the temperature increases from 302 to 317 K
We have experimentally investigated the temperature-dependent optical performance of AlGaN-based DUV LEDs via a convenient method combined with EL, infrared thermography method. The current–voltage (I–V), and device temperature measurements
Summary
The outbreak of coronavirus disease 2019 (COVID-19) has undoubtedly threatened the public health and has an enormous impact on the global economy since the end of 2019.1,2 Precautions such as alcohol-based disinfectants, high-temperature sterilization, and deep ultraviolet (DUV) disinfection are advisable to limit the high transmission efficiency of COVID-19 through direct contact or airborne routes. In situations where alcohol-based disinfectants and high-temperature sterilization are not applicable, we could resort to DUV light sources from mercury lamps and. LED, obtaining the electrical, optical, and thermal properties within one measurement During this measurement, the device parameters, such as voltage, current, LOP, and device temperature, are determined and can be further interpreted for wall-plug efficiency (WPE), ideality factor (β), and series resistance (Rs). The device parameters, such as voltage, current, LOP, and device temperature, are determined and can be further interpreted for wall-plug efficiency (WPE), ideality factor (β), and series resistance (Rs) The changes in these parameters can be separated into two regions. Combining the results from the experiment and simulation, we can derive the origin of the high value of β and give a profound insight into the temperature-dependent device performance, which would do significant favor to develop high optical output AlGaN-based DUV LEDs
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