scholarly journals 1.9 W yellow, CW, high-brightness light from a high efficiency semiconductor laser-based system

2017 ◽  
Author(s):  
A. K. Hansen ◽  
M. Christensen ◽  
D. Noordegraaf ◽  
P. Heist ◽  
E. Papastathopoulos ◽  
...  
Keyword(s):  
Semiconductor Laser ◽  
High Efficiency ◽  
High Brightness

A New Prediction Model on the Luminance of OLEDs Subjected to Different Reverse Biases for Alleviating Degradation in AMOLED Displays

2014 ◽  
Author(s):  
Paul C.-P. Chao ◽  
Yen-Ping Hsu ◽  
Yung-Hua Kao ◽  
Kuei-Yu Lee
Keyword(s):  
Reverse Bias ◽  
High Efficiency ◽  
Life Time ◽  
Density Currents ◽  
High Brightness ◽  
Light Emitting ◽  
Wide Viewing Angle ◽  
Time Operation ◽  
Long Time ◽  
History Of

Organic light-emitting diodes (OLEDs) have drawn much attention in areas of displays and varied illumination devices due to multiple advantages, such as high brightness, high efficiency, wide viewing angle, and simple structure. However, the long-time degradation of OLED emission is a serious drawback. This degradation was investigated by past works, which pointed out that the degradation was induced by high-density currents through OLED component under the long-time operation [1][2]. Proposed by a past work [3], different reverse biases was imposed on OLED components in display frames to alleviate the long-time degradation on OLEDs. Most recently, along with the reverse bias, new pixel circuits [4][5] for AMOLED displays are designed to alleviate OLED degradation, thus successfully extending OLED life time. However, since emission luminances in different frame times during AMOLED displaying differs significantly for displaying varied images, the OLED degradation evolves in a highly unpredictable fashion. In this study, based on valid theories, the voltage across the OLED is first used as indicator for OLED degradation. Then the relation between the level of OLED degradation, in terms of OLED’s cross voltage, and the history of imposing reverse biases are precisely modeled. With the model, the degradation of the OLED under reverse bias to extend lifetime can be successfully predicted. Based on this model, engineers can then optimize the applied reverse bias on OLEDs to maximize the OLED lifetime for varied display requirement.

Low Vertical Devergence Angle and High Brightness Photonic Crystal Semiconductor Laser

2017 ◽  
Vol 44 (2) ◽  
pp. 0201010 ◽  
Author(s):  
周旭彦 Zhou Xuyan ◽  
赵少宇 Zhao Shaoyu ◽  
马晓龙 Ma Xiaolong ◽  
刘 云 Liu Yun ◽  
李伦华 Li Lunhua ◽  
...  
Keyword(s):  
Photonic Crystal ◽  
Semiconductor Laser ◽  
High Brightness

High-Brightness 800-nm Semiconductor Laser Source Based on Spectral Beam Combining

2020 ◽  
Vol 47 (7) ◽  
pp. 0701021
Author(s):  
张俊 Zhang Jun ◽  
彭航宇 Peng Hangyu ◽  
付喜宏 Fu Xihong ◽  
秦莉 Qin Li ◽  
宁永强 Ning Yongqiang ◽  
...  
Keyword(s):  
Semiconductor Laser ◽  
Laser Source ◽  
High Brightness ◽  
Beam Combining ◽  
Spectral Beam Combining

High-brightness 808 nm semiconductor laser diode packaged by SiC heat sink

2020 ◽  
Vol 67 (11) ◽  
pp. 1017-1021
Author(s):  
Xingyu Li ◽  
Kai Jiang ◽  
Zhen Zhu ◽  
Jian Su ◽  
Wei Xia ◽  
...  
Keyword(s):  
Semiconductor Laser ◽  
Laser Diode ◽  
Heat Sink ◽  
High Brightness ◽  
Semiconductor Laser Diode

Improvement of efficiency and its roll-off at high brightness in white organic light-emitting diodes by strategically managing triplet excitons in the emission layer

2018 ◽  
Vol 6 (40) ◽  
pp. 10793-10803 ◽  
Author(s):  
Shian Ying ◽  
Dezhi Yang ◽  
Xianfeng Qiao ◽  
Yanfeng Dai ◽  
Qian Sun ◽  
...  
Keyword(s):  
High Performance ◽  
High Efficiency ◽  
Light Emitting Diodes ◽  
Organic Light Emitting Diodes ◽  
Emission Layer ◽  
High Brightness ◽  
Light Emitting ◽  
Organic Light ◽  
Low Efficiency ◽  
Triplet Excitons

High-performance WOLEDs realizing high efficiency and low efficiency roll-off simultaneously were achieved by strategically managing triplet excitons in the emission layer.

Highly efficient dual-core derivatives with EQEs as high as 8.38% at high brightness for OLED blue emitters

2019 ◽  
Vol 7 (46) ◽  
pp. 14709-14716 ◽  
Author(s):  
Seokwoo Kang ◽  
Hyocheol Jung ◽  
Hayoon Lee ◽  
Sunwoo Park ◽  
Joonghan Kim ◽  
...  
Keyword(s):  
High Efficiency ◽  
High Luminance ◽  
High Brightness ◽  
Highly Efficient ◽  
Fluorescent Materials ◽  
Blue Emitters ◽  
Dual Core ◽  
Very High

Three blue fluorescent materials were newly synthesized. A device doped with p-TPA-AP-TPA displayed a very high efficiency of 9.14 cd A−1 and an EQE of 8.38% at a high luminance of 5000 cd m−2.

Sign in / Sign up

Export Citation Format

Share Document