2016 13th China International Forum on Solid State Lighting (SSLChina)最新文献

The impact of dynamic light with different CCT ranges and frequencies on human alertness 不同CCT范围和频率的动态光对人类警觉性的影响

2016 13th China International Forum on Solid State Lighting (SSLChina) Pub Date : 2016-11-01 DOI: 10.1109/SSLCHINA.2016.7804364

M. Ye, S. Zheng, M. Luo

{"title":"The impact of dynamic light with different CCT ranges and frequencies on human alertness","authors":"M. Ye, S. Zheng, M. Luo","doi":"10.1109/SSLCHINA.2016.7804364","DOIUrl":"https://doi.org/10.1109/SSLCHINA.2016.7804364","url":null,"abstract":"Light could have an acute effect on human performance, including task performance, alertness and phase shift. Most studies have investigated the alerting effect of static light. The aim of the present study is to investigate the effect of dynamic light of changing frequency and CCT range on human alertness and task performance. Ten participants including 7 males and 3 females took part to perform six phases of dynamic light by varying their CCT range and CCT frequency. There are six experimental phases: CCT ranging from 4000K to 10000K, with frequency at 2h, 1h, 0.5h, and CCT ranging from 6000K to 12000K, with frequency 2h, 1h, 0.5h. EEG alpha, beta power, 2-back and 3-back task and questionnaires were used to measure each subject. The results showed that, power in alpha range was significantly, i.e. lower after exposure in high CCT condition than low CCT condition. Beta power was also significantly higher in high frequency condition than low frequency. For both 2-back and 3-back tasks, participants perform significantly better in high CCT condition, but no marked difference between different frequency. It was also found that there is a significant different effect on the questionnaire score between different CCT ranges. In general, participants felt more alert in higher CCT range condition and higher CCT frequency conditions. The results can be used to overcome drowsiness after lunch, to increase alertness and to improve work efficiency.","PeriodicalId":413080,"journal":{"name":"2016 13th China International Forum on Solid State Lighting (SSLChina)","volume":"169 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2016-11-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"127500070","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

Geometric effects of LGA solder joint on board level reliability in 2-pad ceramic LED assembly LGA焊点对2片陶瓷LED组件板级可靠性的几何影响

2016 13th China International Forum on Solid State Lighting (SSLChina) Pub Date : 2016-11-01 DOI: 10.1109/SSLCHINA.2016.7804347

Jing Zhang, Guoqi Zhang

引用次数: 2

SCIL nanoimprint solutions: Cost-effective high volume nano structuring of sapphire wafers SCIL纳米压印解决方案:具有成本效益的蓝宝石晶圆的高容量纳米结构

2016 13th China International Forum on Solid State Lighting (SSLChina) Pub Date : 2016-11-01 DOI: 10.1109/SSLCHINA.2016.7804335

R. Voorkamp, M. Verschuuren, R. van Brakel

引用次数: 0

Fatigue failure modeling of wire bonds of high power LED packages with a multiphysics simulation method 基于多物理场仿真的大功率LED封装线键疲劳失效建模

2016 13th China International Forum on Solid State Lighting (SSLChina) Pub Date : 2016-11-01 DOI: 10.1109/SSLCHINA.2016.7804346

Kai Chen, Jiajie Fan, C. Qian, Bin Tang, Xuejun Fan, Guoqi Zhang

{"title":"Fatigue failure modeling of wire bonds of high power LED packages with a multiphysics simulation method","authors":"Kai Chen, Jiajie Fan, C. Qian, Bin Tang, Xuejun Fan, Guoqi Zhang","doi":"10.1109/SSLCHINA.2016.7804346","DOIUrl":"https://doi.org/10.1109/SSLCHINA.2016.7804346","url":null,"abstract":"Today, high-power LED packages have been widely used in many fields by virtue of its high efficiency, long service life and small size etc. A LED package consists of many different components, which are made of different materials being operated under different conditions. As a result, each component has its own pattern of impact on the reliability problem of LED packages, such as chip failure, package failure, and interconnection failure and so on. Among these failures, the fatigue failure of wire bonds those work as the interconnection is a common but severe issue that will cause a catastrophic failure of the LED package. Therefore developing a precise prediction method for the fatigue lifetime of the wire bonds has attracted many attentions of LED manufacturers and researchers. In this paper, the thermal, mechanical stress distributions on a high power LED package driven by different currents were simulated from a thermal-mechanical finite element simulation with the ANSYS Multiphysics module. Then the mean cycles to failure could be estimated based on the semi-empirical fatigue model.","PeriodicalId":413080,"journal":{"name":"2016 13th China International Forum on Solid State Lighting (SSLChina)","volume":"1 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2016-11-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"131495499","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

High reliability driving solution for solid state lighting 固态照明的高可靠性驱动解决方案

2016 13th China International Forum on Solid State Lighting (SSLChina) Pub Date : 2016-11-01 DOI: 10.1109/SSLCHINA.2016.7804350

Delai Jiang, Huajian Zhang, G. Hua

引用次数: 1

Effects of LED lighting on office work performance LED照明对办公室工作绩效的影响

2016 13th China International Forum on Solid State Lighting (SSLChina) Pub Date : 2016-11-01 DOI: 10.1109/SSLCHINA.2016.7804366

M. Wang, M. Luo

引用次数: 8

Photoluminescence and thermal stability of Mn2+-doped CdSe/CdS/ZnS quantum dots 掺杂Mn2+的CdSe/CdS/ZnS量子点的光致发光和热稳定性

2016 13th China International Forum on Solid State Lighting (SSLChina) Pub Date : 2016-11-01 DOI: 10.1109/SSLCHINA.2016.7804352

P. Ning, Chao Zhang, J. G. Liu, Hongwei Liu, Yuqiang Li, Yiqun Gao, Pingjuan Niu

引用次数: 1

Thermal design and simulation analysis of GaN based MPS switching diode GaN基MPS开关二极管的热设计与仿真分析

2016 13th China International Forum on Solid State Lighting (SSLChina) Pub Date : 2016-11-01 DOI: 10.1109/SSLCHINA.2016.7804353

Wu Siwei, Z. Jianhua, Yang Lianqiao, Wu Xing-yang, Yin Luqiao

{"title":"Thermal design and simulation analysis of GaN based MPS switching diode","authors":"Wu Siwei, Z. Jianhua, Yang Lianqiao, Wu Xing-yang, Yin Luqiao","doi":"10.1109/SSLCHINA.2016.7804353","DOIUrl":"https://doi.org/10.1109/SSLCHINA.2016.7804353","url":null,"abstract":"Merged PiN/Schottky power (hereinafter referred to as MPS) switching diode has the advantages of high blocking voltage, low leakage current, high switching speed, high current, low voltage and so on. Based on the above advantages, in modern society, the power of MPS switching diode is getting larger and larger, which is used in many fields, and almost all electrical energy converts into heat, so that the chip junction temperature rises rapidly, when the temperature exceeds the maximum allowable temperature, the MPS power switching diode will be damaged due to overheating, so heat dissipation is the key problem for MPS package. In this study, the heat sink is installed under the MPS diode, so heat can be exchanged with the surrounding environment by adopting to forced convection, and combined with high thermal conductivity material as insulating layer of the MPS diode substrate, so the heat generated can be dissipated in a timely manner. In this paper, aiming at the heat characteristics of high power MPS switching diode, a three-dimensional model of the MPS power switching diode is constructed by using three-dimensional drawing software Solid-Works. The diamond like carbon (DLC) film and aluminum oxide (Al2O3) film are respectively used as the insulating layers of the substrate, and the thermal analysis is carried out by ANSYS. Through changing the forced convection coefficient on the surface of the radiator, the relationship between the different convection coefficient and the maximum temperature of the device is obtained. In addition to thermal analysis, the temperature distribution of the device is obtained by infrared thermal imaging instrument test method.","PeriodicalId":413080,"journal":{"name":"2016 13th China International Forum on Solid State Lighting (SSLChina)","volume":"39 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2016-11-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"115101517","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

The ergonomie research on aircraft cabin mood lighting 飞机客舱情绪照明的人机工程学研究

2016 13th China International Forum on Solid State Lighting (SSLChina) Pub Date : 2016-11-01 DOI: 10.1109/SSLCHINA.2016.7804367

Yan Lu, Yandan Lin, Jizhong Liu, Li Yang, Wei Li

引用次数: 2

A new method of LED junction temperature modeling and measurement 一种新的LED结温建模与测量方法

2016 13th China International Forum on Solid State Lighting (SSLChina) Pub Date : 2016-11-01 DOI: 10.1109/SSLCHINA.2016.7804348

Xiangyu Huang, Yuzhen Xu, Weiming Lin

引用次数: 0