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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 | Congenital double elevator palsy:Vertical saccadic velocity utilizing the scleral search coil technique显示文摘 | Ziffer AJ Rosenbaum AL Demer JL | | 0，，： | 1 |
| 3 | The effect of anterior transposition of the inferior oblique muscle显示文摘 | Ziffer AJ Isenberg SJ Elliott RL | 1993 | Am J Ophthalmol1993，116，2： | 1 |
| 4 | Use of a multitarget fluorescence in situ hybridization assay to diagnose bladder cancer in patients with hematuria 显示文摘 | Sarosdy MF Kahn PR Ziffer MD | 2006 | J Urol2006，176，1： | 1 |
| 5 | Use of a multitarget fluorescence in situ hybridization assay to diagnose bladder cancer in patients with hematuria显示文摘 | Sarosdy MF Kahn PR Ziffer MD | 2006 | J Urol2006，176，1： | 1 |
| 6 | Use of a multitarget fluorescence in situ hybridization assay to diagnose bladder cancer in patients with hematuria显示文摘 | Sarosdy MF Kahn PR Ziffer MD | 2006 | J Urol2006，176，1： | 1 |
| 7 | Convenient method for the preparation of reactive oxiranes by direct epoxidation显示文摘 | Imuta M Ziffer H | 1979 | J Org Chem1979，44，8： | 1 |
| 8 | Amblyopia in congenital ptosis显示文摘 | Hornblass A Kass L G Ziffer A J | 1995 | Ophthalmic Surg1995，26，4： | 1 |
| 9 | Use of a Multi larger Fluorescence In Situ Hybridization Assay to Diagnose Bladder Cancer in Patients With Hematuria 显示文摘 | Sarosdy M F Kahn P R Ziffer M D | 2006 | J Urol2006，176，1： | 1 |
| 10 | Use of a multitarget fluorescence in situ hybridization assay to diagnose bladder cancer in patients with hematuria显示文摘 | Sarosdy MF Kahn PR Ziffer MD | 2006 | J Urol2006，176，1： | 1 |
| 11 | Use of a multitarget fluorescence in situ hybridization assay to diagnose bladder cancer in patients with hematuria 显示文摘 | SAROSDY MF KAHN PR ZIFFER MD | 2006 | J Urol2006，176，1： | 1 |
| 12 | Use of a multitarget fluorescence in situ hybridization assay to diagnose bladder cancer in patients with hematuria显示文摘 | Sarosdy MF Kahn PR Ziffer MD | 2006 | J Urol2006，176，1： | 1 |
| 13 | Use ofa muhitarget fluorescence in situ hybridization assay to diagnose bladder eancer in patients with hematuri显示文摘 | Sarosdy MF Kahn PR Ziffer MD | 2006 | J Urol2006，176，1： | 1 |
| 14 | Stereoselective Oxidations of a β - methylglycal, Anhydrodihydroartemisinin 显示文摘 | PU Y M YAGEN B ZIFFER H | 1994 | Tetrahedron Letters1994，35，： | 1 |
| 15 | Use of a muhitarget fluores- cence in situ hybridization assay to diagnose bladder cancer in patients with hematuria显示文摘 | Sarosdy MF Kahn PR Ziffer MD | 2006 | J Urol2006，176，1： | 1 |
| 16 | Myocardial perfusion imaging is a routinely effective triage tool to evaluate ongoing and recently resolved chest pain in a dedicated center显示文摘 | Ziffer J Nateman D Janowitz W | 1997 | J Nucl Med1997，38，： | 1 |
| 17 | Use of a multitarget fluorescence in situ hybridization assay to diagnose bladder cancer in patients with hematuria显示文摘 | Sarosdy MF Kahn PR Ziffer MD | 2006 | J Urol2006，176，1： | 1 |
| 18 | Use of a multitar- get fluorescence in situ hybridization assay to diagnose bladder cancer in patients with hematuria显示文摘 | Sarosdy MF Kahn PR Ziffer MD | 2006 | J Urol2006，176，1： | 1 |
| 19 | Use of a muhitarget fluores- cence in situ hybridization assay to diagnose bladder cancer in patients with hematuria显示文摘 | Sarosdy MF Kahn PR Ziffer MD | 2006 | J Urol2006，176，1： | 1 |
| 20 | Use of a multitarget fluorescence in situ hybridization assay to diagnose bladder cancer in patients with he- maturi显示文摘 | SAROSDY M F KAHN P R ZIFFER M D | 2006 | J Urol2006，176，： | 1 |
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