Zobrazeno 1 - 10
of 204
pro vyhledávání: '"Han Youl Ryu"'
Autor:
Sangjin Min, Won-Jin Choi, Dong Hwan Kim, Keuk Kim, Jaehyeok Park, Han-Youl Ryu, Jong-In Shim, Dong-Soo Shin
Publikováno v:
AIP Advances, Vol 14, Iss 10, Pp 105201-105201-4 (2024)
Red micro-light-emitting diodes (μ-LEDs) with AlGaInP/GaInP multiple quantum wells are fabricated with an oxide perimeter region to control the current injection path. When the values of the external quantum efficiency (EQE) of the 30 μm-size μ-LE
Externí odkaz:
https://doaj.org/article/7c1f442fe70c4de3bd3b63373d5269fe
Autor:
Chibuzo Onwukaeme, Han-Youl Ryu
Publikováno v:
Nanomaterials, Vol 14, Iss 17, p 1409 (2024)
The efficiency of current GaN-based blue laser diodes (LDs) is limited by the high resistance of a thick p-AlGaN cladding layer. To reduce the operation voltage of InGaN blue LDs, we investigated optimum LD structures with an indium tin oxide (ITO) p
Externí odkaz:
https://doaj.org/article/6a0d45fb9f0c42d8b5e07e40e62b03ba
Autor:
Bohae Lee, Han-Youl Ryu
Publikováno v:
Crystals, Vol 14, Iss 3, p 241 (2024)
We investigated the effect of cross-sectional shape and size on the light-extraction efficiency (LEE) of GaN-based blue nanorod light-emitting diode (LED) structures using numerical simulations based on finite-difference time-domain methods. For accu
Externí odkaz:
https://doaj.org/article/c63dc2c3aff04a5a96d462c6d1192d7e
Publikováno v:
IEEE Photonics Journal, Vol 12, Iss 2, Pp 1-10 (2020)
We conducted a systematic investigation of the light extraction efficiency (LEE) of GaN-based vertical micro-scale light-emitting diode (μ-LED) structures using three-dimensional finite-difference time-domain (FDTD) simulations. The LEE of μ-LED st
Externí odkaz:
https://doaj.org/article/148fa5e1ce134184a514776c29052c0a
Publikováno v:
Nanomaterials, Vol 12, Iss 14, p 2405 (2022)
We investigated the temperature dependence of the electron leakage current in the AlGaN electron-blocking layer (EBL) of an InGaN/GaN blue light-emitting diode (LED) structure at temperatures between 20 and 100 °C. The percentage of electron leakage
Externí odkaz:
https://doaj.org/article/cf39a04909a64fa7949fb740bae66f72
Autor:
Chibuzo Onwukaeme, Han-Youl Ryu
Publikováno v:
Crystals, Vol 11, Iss 11, p 1335 (2021)
In GaN-based laser diode (LD) structures, Mg doping in p-type-doped layers has a significant influence on the device performance. As the doping concentration increases, the operation voltage decreases, whereas the output power decreases as a result o
Externí odkaz:
https://doaj.org/article/4f52d2a0aed44737ae0565671979392e
Publikováno v:
Micromachines, Vol 12, Iss 8, p 999 (2021)
We investigated the crystallinities of poly silicon (poly Si) annealed via green laser annealing (GLA) with a 532-nm pulsed laser and blue laser annealing (BLA) with 450-nm continuous-wave lasers. Three-dimensional heat transfer simulations were perf
Externí odkaz:
https://doaj.org/article/dec3ebe9931e41a38c242fdb109d9871
Autor:
Han-Youl Ryu
Publikováno v:
Nanoscale Research Letters, Vol 12, Iss 1, Pp 1-7 (2017)
Abstract GaN-based blue laser diodes (LDs) may exhibit anomalous temperature characteristics such as a very high characteristic temperature (T 0) or even negative T 0. In this work, temperature-dependent characteristics of GaN-based blue LDs with InG
Externí odkaz:
https://doaj.org/article/1b248d924023427db6d8bad266755796
Publikováno v:
AIP Advances, Vol 9, Iss 1, Pp 015009-015009-5 (2019)
We experimentally investigated the temperature dependence of the color rendering index (CRI) of a phosphor-conversion (PC) white light-emitting diode (LED) composed of a GaN-based blue LED chip and yttrium aluminum garnet doped with Ce3+ (YAG) phosph
Externí odkaz:
https://doaj.org/article/6d0208746a744c3b8ee8b21fea25a2d3
Autor:
Hyuck Choo, Byounglyong choi, Han-Youl Ryu, Kyoungho Ha, Eunkyung Lee, Dongshik Shim, Changbum Lee, hyunil byun, Tatsuhiro Otsuka, Inoh Hwang, Jisan Lee, changgyun shin, Dong Shin
The optical phased array has been developed to realize solid-state optical beam steering following the advent of silicon photonics. Thus far, its feasibility has lacked either steering quality or optical efficiency, and its optimal design still remai
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_dedup___::585816ba5f1da889934a9ee310e9d544
https://doi.org/10.1364/opticaopen.22005074
https://doi.org/10.1364/opticaopen.22005074
