Results 311 to 320 of about 1,353,383 (365)

Improvement of light extraction efficiency in GaN-based light-emitting diodes by addition of complex photonic crystal structure

Materials Research Express, 2019
To improve the light extraction efficiency of a GaN-based light-emitting diode (LED), a new complex periodic photonic crystal structure containing two kinds of hemispheres was designed. This complex photonic crystal structure is arrayed on the surface of
D. Ge, Xiukang Huang, Jinxiu Wei, Pengfei Qian, Liqiang Zhang, J. Ding, Shi-ning Zhu   +6 more
semanticscholar   +1 more source

Effects of light extraction efficiency to the efficiency droop of InGaN-based light-emitting diodes

Journal of Applied Physics, 2013
Light extraction efficiency (LEE) droop as an important factor contributing to the efficiency droop of InGaN-based light-emitting diodes (LEDs) has been demonstrated and investigated in detail. The LEE droop effect is induced by the spatial dependence of the extraction efficiency of photons inside of the LED devices and the aggravating crowding effect ...
Yiyun Zhang, Haiyang Zheng, Enqing Guo, Yan Cheng, Jun Ma, Liancheng Wang, Zhiqiang Liu, Xiaoyan Yi, Guohong Wang, Jinmin Li   +9 more
openaire   +1 more source

High-Efficiency Deep-Ultraviolet Light-Emitting Diodes With Efficient Carrier Confinement and High Light Extraction

IEEE Transactions on Electron Devices, 2019
In deep-ultraviolet (DUV) light-emitting diodes (LEDs), it is difficult to obtain both efficient carrier confinement and high light extraction, which are quite sensitive to optical polarization and other physical parameters. In this paper, characteristics of DUV LEDs with various n-AlGaN layers and quantum barriers (QBs), and various widths of quantum ...
Jih-Yuan Chang, Bo-Ting Liou, Man-Fang Huang, Ya-Hsuan Shih, Fang-Ming Chen, Yen-Kuang Kuo   +5 more
openaire   +1 more source

High Light Extraction Efficiency of Deep Ultraviolet LEDs Enhanced Using Nanolens Arrays

IEEE Transactions on Electron Devices, 2018
To improve the light extraction efficiency (LEE) of AlGaN-based deep ultraviolet LEDs (DUV-LEDs) by simple and effective method, this has greatly attracted ever-growing attention in DUV-LEDs field.
Renli Liang, J. Dai, Linlin Xu, Ju He, Shuai Wang, Yang Peng, Hao Wang, Lei Ye, Changqin Chen   +8 more
semanticscholar   +1 more source

Improved light extraction efficiency in III-nitride photonic crystal light-emitting diodes

SPIE Proceedings, 2005
We observed a significant enhancement in light output from GaN-based light-emitting diodes (LEDs) in which two-dimensional photonic crystal (PC) patterns were integrated. We approached two types PC LEDs. One is top loaded PC LEDs. The PC patterns were generated on the top p-GaN layer. The other is bottom loaded PC LEDs.
Dong-Ho Kim, Jaehoon Kim, Heonsu Jeon, Yoon Soo Park, Jaehee Cho, Jin Seo Im, Cheolsoo Sone, Yongjo Park   +7 more
openaire   +1 more source

High light-extraction efficiency in GaInN light-emitting diode with pyramid reflector

SPIE Proceedings, 2007
ABSTRACT A GaInN light-emitting diode (LED) that employs a new type of reflector consisting of an array of SiO 2 pyramids and a reflective Ag layer is demonstrated to have enhanced light extraction compared to GaInN LEDs with a planar Ag reflector.
J-Q. Xi, Hong Luo, Jong Kyu Kim, E. F. Schubert   +3 more
openaire   +1 more source

Dual pattern for enhancing light extraction efficiency of white organic light-emitting diodes

Organic electronics, 2018
Nano and micro-patterns (dual patterns) were introduced on a glass substrate as an extraction layer to enhance the light extraction efficiency of white organic light-emitting diodes (WOLEDs). The dual-patterned glass was fabricated by thermal evaporation,
Kwan Kim, K. Han, Yangdoo Kim, Daihong Huh, Yoonjay Han, Heon Lee, Jang‐Joo Kim   +6 more
semanticscholar   +1 more source

Enhanced Light Extraction Efficiency of GaN-Based Hybrid Nanorods Light-Emitting Diodes

IEEE Journal of Selected Topics in Quantum Electronics, 2015
High light extraction GaN-based light-emitting diodes (LEDs) with a hybrid structure of straight nanorods located in an array of microholes have been successfully demonstrated. Via the nanoimprint lithography and photolithography techniques, high aspect-ratio light-guiding InGaN/GaN nanorods can be fabricated and regularly arranged in microholes ...
Jhih-Kai Huang, Che-Yu Liu, Tzi-Pei Chen, Hung-Wen Huang, Fang-I Lai, Po-Tsung Lee, Chung-Hsiang Lin, Chun-Yen Chang, Tsung Sheng Kao, Hao-Chung Kuo   +9 more
openaire   +1 more source

36‐3: Improvement of Light Extraction Efficiency of Laser‐Phosphor Light Source

SID Symposium Digest of Technical Papers, 2017
We investigated the laser‐phosphor light source by using inorganic phosphor wheel. We experimentally confirmed the light extraction efficiency of the inorganic phosphor wheel which is 8% higher than conventional phosphor wheel. In addition, we explain about the cause of improvement of the efficiency by showing fluorescence emission model.
Hiroki Morita, Yuki Maeda, Izushi Kobayashi, Yoshihisa Sato, Tsuneharu Nomura, Hiroki Kikuchi   +5 more
openaire   +1 more source

Characterization of light extraction efficiency for WOLEDS with light‐out‐coupling layer

Journal of the Society for Information Display, 2015
AbstractWe studied the light extraction efficiencies of white organic light‐emitting diodes with a light‐out‐coupling layer by simulations and experiments. The light extraction efficiencies estimated by the simulation were confirmed to agree well with those measured by the experiments.
Motoko Harada, Hironori Wakana, Shunichiro Nobuki, Hirotaka Sakuma, Masahiro Kawasaki, Sukekazu Aratani   +5 more
openaire   +1 more source