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| 1 | Improved performance of UVC-LEDs by combination of high-temperature annealing and epitaxially laterally overgrown AlN/sapphire显示文摘We report on the performance of AlGaN-based deep ultraviolet light-emitting diodes(UV-LEDs)emitting at 265 nm grown on stripe-patterned high-temperature annealed(HTA)epitaxially laterally overgrown(ELO)aluminium nitride(AIN)/sapphire templates.For this purpose,the structural and electro-optical properties of ultraviolet-c light-emitting diodes(UVC-LEDs)on as-grown and on HTA planar AlN/sapphire as well as ELO AlN/sapphire with and without HTA are investigated and compared.Cathodoluminescence measurements reveal dark spot densities of 3.5×10^9 cm^-2,1.1×10^9 cm^-2,1.4×10^9 cm^-2,and 0.9×10^9 cm^-2 in multiple quantum well samples on as-grown planar AIN/sapphire,HTA planar AlN/sapphire,ELO AlN/sapphire,and HTA ELO AlN/sapphire,respectively,and are consistent with the threading dislocation densities determined by transmission electron microscopy(TEM)and high-resolution X-ray diffraction rocking curve.The UVC-LED performance improves with the reduction of the threading dislocation densities(TDDs).The output powers(measured on-wafer in cw operation at 20 mA)of the UV-LEDs emitting at 265 nm were 0.03 mW(planar AlN/sapphire),0.8 mW(planar HTA AlN/sapphire),0.9 mW(ELO AlN/sapphire),and 1.1 mW(HTA ELO AlN/sapphire),respectively.Furthermore,Monte Carlo ray-tracing simulations showed a 15%increase in light-extraction efficiency due to the voids formed in the ELO process.These results demonstrate that HTA ELO AlN/sapphire templates provide a viable approach to increase the efficiency of UV-LEDs,improving both the internal quantum efficiency and the light-extraction efficiency. | NORMAN SUSILO EVIATHAR ZIFFER SYLVIA HAGEDORN LEONARDO CANCELLARA CARSTEN NETZEL NEYSHA LOBO PLOCH SHAOJUN WU JENS RASS SEBASTIAN WALDE LUCA SULMONI MARTIN GUTTMANN TIM WERNICKE MARTIN ALBRECHT MARKUS WEYERS MICHAEL KNEISSL | 2020 | Photonics Research2020，8，4： | 4 |
| 2 | 新冠肺炎确诊一年后的神经系统后遗症显示文摘已有多项研究报道了与COVID-19相关的神经系统并发症。这项前瞻性研究旨在探讨接受COVID-19治疗患者的神经系统症状和体征的自然病史。受试者是被诊断为COVID-19后症状持续至少6周的成年患者。在确诊3个月时,对所有患者进行心肺评估、认知评估、抑郁评估、焦虑评估、实验室检查和胸部CT等神经系统检查。这项研究纳入135例患者,对其中76例患者进行3个月和1年的随访。报告显示59%的患者在新冠确诊1年后至少有一种神经系统症状持续存在。其中最常见的症状是疲劳(38%)、注意力不集中(25%)、健忘(25%)和睡眠障碍(22%)。 | 张东云(译) Rass V | 2022 | 中国康复2022，37，8： | 3 |
| 3 | Current-induced degradation and lifetime prediction of 310 nm ultraviolet light-emitting diodes显示文摘The impact of operation current on the degradation behavior of 310 nm UV LEDs is investigated over 1000 h of stress. It ranges from 50 to 300 mA and corresponds to current densities from 34 to 201 A/cm^2.To separate the impact of current from that of temperature, the junction temperature is kept constant by adjusting the heat sink temperature. Higher current was found to strongly accelerate the optical power reduction during operation. A mathematical model for lifetime prediction is introduced.It indicates that lifetime is inversely proportional to the cube of the current density, suggesting the involvement of Auger recombinati on. | Jan Ruschel Johannes Glaab Batoul Beidoun Neysha Lobo Ploch Jens Rass Tim Kolbe Arne Knauer Markus Weyers Sven Einfeldt Michael Kneissl | 2019 | Photonics Research2019，7，7： | 3 |
| 4 | Recombination mechanisms and thermal droop in AlGaN-based UV-B LEDs显示文摘This paper reports a comprehensive analysis of the origin of the electroluminescence(EL)peaks and of the thermal droop in UV-B AlGaN-based LEDs.By carrying out spectral measurements at several temperatures and currents,(i)we extract information on the physical origin of the various spectral bands,and(ii) we develop a novel closed-form model based on the Shockley–Read–Hall theory and on the ABC rate equation that is able to reproduce the experimental data on thermal droop caused by non-radiative recombination through deep levels.In the samples under test,the three EL bands are ascribed to the following processes:band-to-band recombination in the quantum wells(main EL peak),a parasitic intra-bandgap radiative transition in the quantum well barriers,and a second defect-related radiative process in the p-AlGaN superlattice. | CARLO DE SANTI MATTEO MENEGHINI DESIREE MONTI JOHANNES GLAAB MARTIN GUTTMANN JENS RASS SVEN EINFELDT FRANK MEHNKE JOHANNES ENSLIN TIM WERNICKE MICHAEL KNEISSL GAUDENZIO MENEGHESSO ENRICO ZANONI | 2017 | Photonics Research2017，5，2： | 2 |
| 5 | Water-based radia- tion-curable latexes显示文摘 | Odeberg J Rassing J J E Jonsson | 1996 | Journal of Applied Polymer Science1996，62，2： | 1 |
| 6 | Community-based in- novation contests : where competition meets cooperation 显示文摘 | Bullinger AC Neyer AK Rass M | 2010 | Creativity and Innovation Management2010，19，3： | 1 |
| 7 | Is soil carbon mostly root carbon? Mechanisms for a specific stabilization显示文摘 | Rasse DP Rumpel C Dignac MF | | 0，，： | 1 |
| 8 | The off-season is 'no sea- son' : The case of the Danish island of Bornholm显示文摘 | Lundtorp S Rassing C Wanhill S | 1999 | Tourism Economics1999，5，1： | 1 |
| 9 | Thromboem- bolic risk and bleeding in patients maintaining or stopping oral anticoagulant therapy during dental extraction 显示文摘 | A1-Mubarak S Rass MA Alsuwyed A | 2006 | J Thromb Haemost2006，4，3： | 1 |
| 10 | The use of rotary instruments as auxiliary aids to root canal preparation of molars 显示文摘 | About - Rass M Jastrab RJ | 1982 | J Endod1982，8，2： | 1 |
| 11 | Retroperitoneoscopic ranal surgery: our approach 显示文摘 | Gill IS Rass weiler JJ | 1999 | Urology1999，54，： | 1 |
| 12 | What school children need to learn about injury prevention显示文摘 | Rass JL Mehta KA Eppes BM | | 0，，4： | 1 |
| 13 | Water-based radiation-curable latexes显示文摘 | ODEBERG J RASSING J JONSSON J E | 1996 | J Appl Polym Sci1996，62，2： | 1 |
| 14 | Nitrogen management impacts on yield and nitrate leaching in inbred maize systems 显示文摘 | RASS D J RITHIE J T PETERSON W R | 1999 | J Environ Qual1999，28，： | 1 |
| 15 | Transoral miniplate osteosynthesis of condylar neck fractures 显示文摘 | Undt G Kermer C Rasse M | 1999 | Oral Surg Oral Med Oral Pathol Oral Radio Endod1999，88，3： | 1 |
| 16 | Lignin degradation during a laboratory incubation followed by ^13C isotope analysis显示文摘 | Bahri H Rasse D P Rumpel C | 2008 | Soil Biology & Biochemistry2008，40，： | 1 |
| 17 | Surface reactive acetyl functional waterborne mieroparticles 显示文摘 | KJEI I QVIST KERSTON RASSING JORGEN WESSLEN BENGT | | Journal of Applied Palymer Science0，5，6： | 1 |
| 18 | Water-Based Radiation-Curable latexes 显示文摘 | Johan Odeberg Jorgen Rassing Jan-Erik Jonsson | 1996 | Journal of Applied Polymer Science1996，62，2： | 1 |
| 19 | Rye cover crop and nitrogen fertilization effects on NO3 -N leaching in inbred maize fields 显示文摘 | Rasse DP Ritchie JT Peterson WR | 2000 | Journal of Environmental Quality2000，29，： | 1 |
| 20 | Vitamin D receptor gene polymorphism in rheumatoid arthritis and associated osteopo- rosis显示文摘 | Rass P Pdkozdi A Lakatos P | 2006 | Rheumatol Int2006，26，11： | 1 |
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