المؤلفون: Zhong Chen, Yi-Cheng Zheng, Yue Lin, Weijie Guo, Zhangbao Peng, Yijun Lu, Ziquan Guo, Tingzhu Wu

المصدر: IEEE Photonics Journal, Vol 12, Iss 1, Pp 1-8 (2020)

مصطلحات موضوعية: lcsh:Applied optics. Photonics, Materials science, 02 engineering and technology, medicine.disease_cause, 01 natural sciences, law.invention, efficiency droop, symbols.namesake, law, +%24{ABC}%24<%2Ftex-math>+<%2Finline-formula>+model%22"> ${ABC}$ model, 0103 physical sciences, medicine, lcsh:QC350-467, Voltage droop, Spontaneous emission, Electrical and Electronic Engineering, Diode, 010302 applied physics, Auger effect, business.industry, Deep ultraviolet light-emitting diodes, Wide-bandgap semiconductor, lcsh:TA1501-1820, 021001 nanoscience & nanotechnology, Atomic and Molecular Physics, and Optics, symbols, recombination mechanisms, Optoelectronics, 0210 nano-technology, business, Recombination, Ultraviolet, lcsh:Optics. Light, Light-emitting diode

الوصف: We investigate temperature-dependent carrier transfer and efficiency droop on AlGaN-based deep ultraviolet light-emitting diodes. The Shockley-Read-Hall (SRH) recombination and carrier leakage are highly associated with the poor thermal stability. The existence of Auger recombination and carrier leakage is identified by the m-power method. A modified ABC model with an additional term f ( n ) related to carrier leakage is employed to analyze the evolution of multiple recombination mechanisms. The SRH process strongly suppresses both Auger recombination and carrier leakage at low currents. At high currents, the latter two processes are responsible for the efficiency droop and exhibit an anti-correlation upon temperature.

الوصول الحر: https://explore.openaire.eu/search/publication?articleId=doi_dedup___::bdebdad61d153a0c242dc8c6ba6dd0adTest
https://ieeexplore.ieee.org/document/8928508Test/

المؤلفون: Tingzhu Wu, Yijun Lu, Ziquan Guo, Zhong Chen, Lihong Zhu, Lili Zheng, Yulin Gao, Ya-Jun Wang

المصدر: IEEE Photonics Journal, Vol 8, Iss 6, Pp 1-9 (2016)

مصطلحات موضوعية: lcsh:Applied optics. Photonics, circadian action factor (CAF), standard light, Optical power, 02 engineering and technology, Color temperature, 01 natural sciences, Red Color, law.invention, 010309 optics, Optics, law, 0103 physical sciences, lcsh:QC350-467, Electrical and Electronic Engineering, color-rendering index (CRI), Physics, business.industry, Nonlinear optics, lcsh:TA1501-1820, 021001 nanoscience & nanotechnology, Atomic and Molecular Physics, and Optics, Light-emitting diode (LED), Wavelength, High color, Optoelectronics, 0210 nano-technology, business, Luminous efficacy, lcsh:Optics. Light, Light-emitting diode

الوصف: For humans, nonvisual biological effects, which can be parameterized by the circadian action factor (CAF), are important for their health and work performance. In this paper, an approach by adjusting electrical currents of three-primary light-emitting diodes (RGB-LEDs) to tune the CAF and color coordinates to be close to those of the standard light with various correlated color temperature (CCT) (2700 K–6500 K) has been reported. This approach is based on deriving an empirical formula between the optical power and the electrical current. In order to meet the requirement of both high color rendering index (CRI) and better CAF, we theoretically perform further spectral optimization on RGB-LEDs and have found that peak wavelengths of 466, 547, and 615 nm for the blue, green, and red color component, respectively, turn out to be the best peak wavelength combination for obtaining both high CRI and high luminous efficacy of radiation of RGB-LEDs, while the CAF, CCT, and color coordinates of RGB-LEDs approach those of the standard light.

الوصول الحر: https://explore.openaire.eu/search/publication?articleId=doi_dedup___::8fbff67fe6ffce7e94bfadbba5a26364Test
https://ieeexplore.ieee.org/document/7728072Test/