Zobrazeno 1 - 10
of 260
pro vyhledávání: '"Joachim Piprek"'
Autor:
Joachim Piprek
Publikováno v:
Materials, Vol 13, Iss 22, p 5174 (2020)
Light-emitting diodes (LEDs) based on Gallium Nitride (GaN) have been revolutionizing various applications in lighting, displays, biotechnology, and other fields. However, their energy efficiency is still below expectations in many cases. An unpreced
Externí odkaz:
https://doaj.org/article/f653912427f740ad9e9838b25c9bd3d8
Publikováno v:
physica status solidi (RRL) – Rapid Research Letters. :2300027
Publikováno v:
Optical and Quantum Electronics. 54
Utilizing self-consistent numerical simulation in good agreement with measurements, we analyze internal device physics, performance limitations, and optimization options for a unique laser design with multiple active regions separated by tunnel junct
Publikováno v:
2021 International Conference on Numerical Simulation of Optoelectronic Devices (NUSOD).
Worldwide research efforts have been focusing on quantum efficiency enhancements of GaN-based light emitters. A promising approach is the separation of multiple active regions by tunnel junctions, enabling electron-hole pairs to generate more than on
Autor:
Joachim Piprek
Numerical simulation and machine learning represent opposite approaches to computational analysis of the real world, deductive vs. inductive. However, both methods suffer from various uncertainties and even their combination often fails to link theor
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_dedup___::0eed69177066c6153ddcf106ebe34219
https://doi.org/10.21203/rs.3.rs-267857/v1
https://doi.org/10.21203/rs.3.rs-267857/v1
Autor:
Joachim Piprek
Publikováno v:
2020 International Conference on Numerical Simulation of Optoelectronic Devices (NUSOD).
Machine learning and numerical simulation represent opposite approaches to computational analysis of the real world, inductive vs. deductive. However, both methods suffer from various uncertainties and even their combination often fails to link theor
Autor:
Joachim Piprek
Focusing on GaN-based light-emitting diode (LED) design optimization, this paper evaluates simulation-based machine learning approaches from a device physics point of view. Strategies are suggested for achieving more realistic results.
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_dedup___::89931448b5f83bbb55eed7a06823b342
https://doi.org/10.36227/techrxiv.12540224
https://doi.org/10.36227/techrxiv.12540224
Autor:
Joachim Piprek
Publikováno v:
Optical and Quantum Electronics. 51
Gallium-nitride-based SLEDs are attractive light sources for augmented reality displays and other applications. However, the electrical-to-optical power conversion efficiency (PCE) of SLEDs is still far below the record-high values reported for LEDs.
Autor:
Zhan-Ming Li, Joachim Piprek
Publikováno v:
IEEE Photonics Technology Letters. 30:963-966
With short current pulses, the output power of semiconductor lasers is limited by non-thermal internal loss mechanisms. Two-photon absorption (TPA) was recently proposed as dominating photon loss process. We investigate this claim by advanced numeric
Autor:
Joachim Piprek
Publikováno v:
IEEE Journal of Quantum Electronics. 53:1-4
Blue light emitting InGaN/GaN lasers currently exhibit less than 40% wall-plug efficiency, while infrared InGaAs/GaAs laser diodes exceed 70%. This paper explores the reasons behind the efficiency limitation by the numerical analysis of measured InGa