2019 16th China International Forum on Solid State Lighting & 2019 International Forum on Wide Bandgap Semiconductors China (SSLChina: IFWS)最新文献_第3页

Junction Temperature Prediction of the Multi-LED Module with the Modified Thermal Resistance Matrix 基于修正热阻矩阵的多led模组结温预测

2019 16th China International Forum on Solid State Lighting & 2019 International Forum on Wide Bandgap Semiconductors China (SSLChina: IFWS) Pub Date : 2019-11-01 DOI: 10.1109/SSLChinaIFWS49075.2019.9019796

Fanny Zhao, Brian Shieh, Fangyun Zeng, Guoming Yang, S. R. Ricky Lee

{"title":"Junction Temperature Prediction of the Multi-LED Module with the Modified Thermal Resistance Matrix","authors":"Fanny Zhao, Brian Shieh, Fangyun Zeng, Guoming Yang, S. R. Ricky Lee","doi":"10.1109/SSLChinaIFWS49075.2019.9019796","DOIUrl":"https://doi.org/10.1109/SSLChinaIFWS49075.2019.9019796","url":null,"abstract":"The junction temperature of LEDs is important for its life, reliability and efficacy. The existing transient measurement method of the junction temperature of using transient thermal tester (T3ster) based on the time-resolved measuring with a constant bias current according to the JESD51-14 is able to obtain the LED junction temperature rise based on the known temperature of thermostat module as the heatsink. In practice, without T3ster and the thermostat module, for multi-LED module with multiple heat sources in the luminaries, the thermal resistance matrix needs to be built to realize the thermal transfer between one another such that their junctions temperature raises can be calculated from their thermal power consumption. It is demonstrated that without measurement of the temperature heatsink temperature, the individual junction temperature of LEDs (groups) in multi-LED module with a thermistor (NTC or PTC) on its PCB measuring the local reference temperature can be obtained from the modified N x (N+1) thermal resistance matrix having N LED heat sources and N+1 junction temperature rise. A multi-LED module sample with 3 groups of LEDs has been studied at 5 different ambient temperatures and 2 additional different power combinations using 3 thermal resistance matrices built at 3 different ambient temperatures for comparison. The result showed that the modified method is effective and convenient for measurement of the junction temperature of the multi-LED modules with a similar accuracy comparing to the conventional one in the local reference temperature range of 20~100°C.","PeriodicalId":315846,"journal":{"name":"2019 16th China International Forum on Solid State Lighting & 2019 International Forum on Wide Bandgap Semiconductors China (SSLChina: IFWS)","volume":"168 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2019-11-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"123818131","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 1

Study on high power density light-emting diodes light source 高功率密度发光二极管光源的研究

2019 16th China International Forum on Solid State Lighting & 2019 International Forum on Wide Bandgap Semiconductors China (SSLChina: IFWS) Pub Date : 2019-11-01 DOI: 10.1109/SSLChinaIFWS49075.2019.9019774

Huaiwen Zheng, Junxi Wang, Jinmin Li, Zhonghua Deng, Zhuguang Liu, Fei Yu, Yan Li, Yuming Yang, Qiao Liang, Hua Yang, X. Yi

引用次数: 0

Smart Lighting with Autonomous Color Tunability 具有自主色彩可调的智能照明

2019 16th China International Forum on Solid State Lighting & 2019 International Forum on Wide Bandgap Semiconductors China (SSLChina: IFWS) Pub Date : 2019-11-01 DOI: 10.1109/SSLChinaIFWS49075.2019.9019798

T. Zheng, Wujun, Zhixian Zhou, Wanghui Yan

引用次数: 2

Design and Characteristics of an Etching Field Limiting Ring for 10kV SiC Power Device 10kV SiC功率器件蚀刻限场环的设计与特性

2019 16th China International Forum on Solid State Lighting & 2019 International Forum on Wide Bandgap Semiconductors China (SSLChina: IFWS) Pub Date : 2019-11-01 DOI: 10.1109/SSLChinaIFWS49075.2019.9019780

Yi Wen, Xiaojie Xu, Hao Zhu, Xuan Li, Xiaochuan Deng, Fei Yang, Jun-tao Li, Bo Zhang

引用次数: 2

A summary to the personal consideration about the light’s influence on myopia, procreation and even philosophy & society 关于光线对近视、生育甚至哲学和社会影响的个人思考综述

2019 16th China International Forum on Solid State Lighting & 2019 International Forum on Wide Bandgap Semiconductors China (SSLChina: IFWS) Pub Date : 2019-11-01 DOI: 10.1109/SSLChinaIFWS49075.2019.9019812

Wenqing Fang, Jiang Fu, Tuanqing Fang, Guoqing Fang, Taiyang Chen, Shanxiao Huang, Youming Zhang, Zhenquan Lai, Chaopu Yang, Kaiqi Fang, Hanbin Jin, Xu Zhang, Xiaojian Han, Chaolin Ma, Yuehui Zheng, Fan Yang

{"title":"A summary to the personal consideration about the light’s influence on myopia, procreation and even philosophy & society","authors":"Wenqing Fang, Jiang Fu, Tuanqing Fang, Guoqing Fang, Taiyang Chen, Shanxiao Huang, Youming Zhang, Zhenquan Lai, Chaopu Yang, Kaiqi Fang, Hanbin Jin, Xu Zhang, Xiaojian Han, Chaolin Ma, Yuehui Zheng, Fan Yang","doi":"10.1109/SSLChinaIFWS49075.2019.9019812","DOIUrl":"https://doi.org/10.1109/SSLChinaIFWS49075.2019.9019812","url":null,"abstract":"This paper summarizes the author’s personal thoughts on some important effects of illumination, spectrum and ‘the Non-visual effects of light’ on axial myopia in recent years, as well as the important effects of ‘Non-visual effects of light’ on human reproduction and even philosophy and society. As far as possible, the author provides the conjecture basis, and also proposes the further verification scheme. Efforts are under way to prove the validity of three main conjectures in animal experiments. The most important speculations is that modern humans may be in a state of sexual excitement, if compared with the people 60 years ago. This wrong state has huge influence on Human reproduction, social customs and all other aspects. In addition, from the perspective of optics, based on the analysis of the concept of focal depth, it is concluded that in addition to dividing day and night based on the ‘Non-visual effects of light’, the light should also be divided into near and far. Desktop reading and writing is using a near-range light, and 300Lx at this time may be too strong, which may lead to axial myopia. The author also believes that too much light in modern people may lead to a low-desire society and philosophically expounds the importance of “darkness”. The author has verified that the light with a low emission of 0.2lx can control the phase of laying eggs in chickens. If it is extended to human ovulation, it will be very terrible, because the illumination of the moon on the ground is also 0.2lx. This partially proves that menstruation originated from the monthly changes in moon light, which may be a dose reference for light to affect human reproduction.","PeriodicalId":315846,"journal":{"name":"2019 16th China International Forum on Solid State Lighting & 2019 International Forum on Wide Bandgap Semiconductors China (SSLChina: IFWS)","volume":"224 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2019-11-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"116385060","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Research on train light environment evaluation method 列车轻环境评价方法研究

2019 16th China International Forum on Solid State Lighting & 2019 International Forum on Wide Bandgap Semiconductors China (SSLChina: IFWS) Pub Date : 2019-11-01 DOI: 10.1109/SSLChinaIFWS49075.2019.9019752

Sijie He, Jinrong Liu, Shuo Jing, Yandan Lin

引用次数: 0

Intelligent Control Semiconductor Laser Reliability Test System 智能控制半导体激光器可靠性测试系统

2019 16th China International Forum on Solid State Lighting & 2019 International Forum on Wide Bandgap Semiconductors China (SSLChina: IFWS) Pub Date : 2019-11-01 DOI: 10.1109/SSLChinaIFWS49075.2019.9019792

Xiaoling Hu, Wensha Lan

{"title":"Intelligent Control Semiconductor Laser Reliability Test System","authors":"Xiaoling Hu, Wensha Lan","doi":"10.1109/SSLChinaIFWS49075.2019.9019792","DOIUrl":"https://doi.org/10.1109/SSLChinaIFWS49075.2019.9019792","url":null,"abstract":"With the development of electronic technology, semiconductor lasers have been widely used in the field of optoelectronics due to their own distinctive features. In order to improve the performance of semiconductor lasers, reliability testing research has become a hot issue at present. In this paper, the intelligent control semiconductor laser reliability test system is described. Its aging and screening process must be controlled by a highly automated, intelligent control system. There are five parts that make up this system: the master control system, the slave control system, the RS-485 serial data interface standard used to communicate between the master unit and the slave unit, the hot stage used to control the test temperature and the power supply includes +5V, +12V, ±15V, +24V. The test system is mainly controlled by AT89C51 single-chip microcomputer, which can not only realize the continuous adjustment of the drive current (0~3A), but also realize the continuous adjustment of the aging temperature (room temperature~150°C). Moreover, the system’s current control accuracy is up to milliamp, and temperature control accuracy is ±0.5°C. The system can also preset the aging current value and the aging temperature value, and display the current working current and working temperature in real time.","PeriodicalId":315846,"journal":{"name":"2019 16th China International Forum on Solid State Lighting & 2019 International Forum on Wide Bandgap Semiconductors China (SSLChina: IFWS)","volume":"97 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2019-11-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"134282785","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

SSLChina: IFWS 2019 Cover Page 2019年IFWS封面

2019 16th China International Forum on Solid State Lighting & 2019 International Forum on Wide Bandgap Semiconductors China (SSLChina: IFWS) Pub Date : 2019-11-01 DOI: 10.1109/sslchinaifws49075.2019.9019779

引用次数: 0

The contrast ratio improvement of perovskite nanocrystals LEDs devices based on carbon nanotubes 基于碳纳米管的钙钛矿纳米晶led器件对比度的改进

2019 16th China International Forum on Solid State Lighting & 2019 International Forum on Wide Bandgap Semiconductors China (SSLChina: IFWS) Pub Date : 2019-11-01 DOI: 10.1109/SSLChinaIFWS49075.2019.9019797

Caiman Yan, Hanguang Lu, Zongtao Li, Jiexin Li, Jiasheng Li, Yong Tang, Binhai Yu

{"title":"The contrast ratio improvement of perovskite nanocrystals LEDs devices based on carbon nanotubes","authors":"Caiman Yan, Hanguang Lu, Zongtao Li, Jiexin Li, Jiasheng Li, Yong Tang, Binhai Yu","doi":"10.1109/SSLChinaIFWS49075.2019.9019797","DOIUrl":"https://doi.org/10.1109/SSLChinaIFWS49075.2019.9019797","url":null,"abstract":"Light emitting diodes (LEDs) are showing explosive growth in the display filed. To obtain high quality color performance display devices, ultraviolet excitation of quantum dots has become an effective solution. However, its contrast ratio (CR) performance limits its further development. Herein, for attaining high CR and color purity display performance, we combined the CsPbBr3/Cs4PbBr6 perovskite nanocrystals (Pero NCs) and carbon nanotubes (CNTs) for LED package. Although the light output combined with CNTs is decreasing because of the CNTs light absorption property, the CR is improved due to the reduced reflectance. Therefore, the green LED with the appropriate CNT concentration could balance the light emission and CR performance. Result shows that with 0.2% CNTs, the green Pero NCs LED boosts the contrast by 18.02% under 50 lx ambient illuminance while the luminous flux drops by 25.0% under 50 mA. And the color purity could be guaranteed over 84% at this CNT concentration. This study provides a better understanding of perovskite NCs LED and guidance on the contrast ratio improvement.","PeriodicalId":315846,"journal":{"name":"2019 16th China International Forum on Solid State Lighting & 2019 International Forum on Wide Bandgap Semiconductors China (SSLChina: IFWS)","volume":"35 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2019-11-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"131901056","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Perovskite liquid quantum dots as a color converter for LD-based white lighting system for visible light communication 钙钛矿液体量子点作为可见光通信中基于lcd的白色照明系统的颜色转换器

2019 16th China International Forum on Solid State Lighting & 2019 International Forum on Wide Bandgap Semiconductors China (SSLChina: IFWS) Pub Date : 2019-11-01 DOI: 10.1109/SSLChinaIFWS49075.2019.9019760

Shunming Liang, Zhou Lu, Xinrui Ding, Jiexin Li, Yong Tang, Zongtao Li, Binhai Yu

引用次数: 3