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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 | 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 |
| 3 | Sleep-ralated myocardial ischemia and sleep structure in patients with obsructive sleep apnea and coronary heart disease显示文摘 | Schafer H Keehler U Ploch | 1997 | Chest1997，111，： | 1 |
| 4 | Coronary heart disease and upper airway obstruction显示文摘 | Schafer H JKohler U Ploch T | 1995 | J Sleep Res1995，4，1： | 1 |
| 5 | Safety concept for cable sup-ported structures显示文摘 | PLOCH J NOVAL B | 2007 | Beton-und Stahlbetonbau2007，102，9： | 1 |
| 6 | Mode of action of gingerols and shogaols on 5-HT3 receptors: binding studies, cation uptake by the receptor channel and contraction of isolated guinea-pig ileum显示文摘 | Abdel-Aziz H Windeck T Ploch M | 2006 | Eur J Pharmacol2006，530，12： | 1 |
| 7 | Effect of nasal continuous positive airway pressure treatment on blood pressure in patients with obstructive sleep apnoea 显示文摘 | Becker C Jerrentrup A Ploch T | 2003 | Circulation2003，107，： | 1 |
| 8 | Coronary heart disease and upper airway obstruction显示文摘 | Kohler U Ploch T | 1995 | J Sleep Res1995，4，1： | 1 |
| 9 | Influence of team compositon and task complexity on team performance显示文摘 | Malcolm Higgs Ulrich Plewnia org Ploch | 2005 | Team Performance Management2005，，78： | 1 |
| 10 | Mode if action of gin- gerols and shogaols on 5 - HT3 receptors: Binding studies, cation up- take by the receptor channel and contraction of isolated guinea - pig ile- um 显示文摘 | Abdel - Aziz H Windesk Y Ploch M | 2006 | Eur J Phamacol2006，530，： | 1 |
| 11 | Hormanal replacement therapy in patients after cervical cancer treatment显示文摘 | Ploch E | 1987 | Gynecol Onco11987，26，2： | 1 |
| 12 | Hormonal replacement therapy in patients after cervical cancer treatment显示文摘 | Ploch E | 1987 | Gynecol Onco11987，26，2： | 1 |
| 13 | Coronary heart disease and upper airway obstruction显示文摘 | Schafer H Kohler U Ploch T | 1995 | J Sleep Res1995，4，1： | 1 |
| 14 | Nutritional ststus, ICU during and ICU mortality in lung transplant recipients显示文摘 | Pezawas L Attemiou O | 1996 | Intensive Care Med1996，22，： | 1 |
| 15 | Hormonal replacement therapy in patients after cervical cancer treatment显示文摘 | Ploch E | 1987 | Gynecol Oncol1987，26，2： | 1 |
| 16 | Effect of nasal continuous positive airway pressure treatment on blood pressure in patients with obstructive sleep apnea显示文摘 | BECKER H F JERRENTRUP A PLOCH T | 2003 | Circulation2003，107，： | 1 |
| 17 | Hormonal replacement therapy in patients after cervical cancer treatment显示文摘 | Ploch E | 1987 | Gynecol Oncol1987，26，2： | 1 |
| 18 | Hormone replacement therapy in patients after cervical cancer treatment显示文摘 | Ploch E | 1987 | Gynecol Oncol1987，26，2： | 1 |
| 19 | Hemodilution and who lebody oxygen balance during normothermic cardiopulmonary bypass in dogs显示文摘 | Ploch LW Cook DJ | 1998 | J Thorac Cardiovasc Surg1998，115，5： | 1 |
| 20 | Effect of nasal continuous positive airway pressure treatment on blood pressure in patients with obstructive sleep apnea显示文摘 | Becker HF Jerrentrup A Ploch T | 2003 | Circulation2003，107，1： | 1 |
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