2015 12th China International Forum on Solid State Lighting (SSLCHINA)最新文献_第3页

Lumen and chromaticity maintenance lifetime prediction for LED lamps using a spectral power distribution method 利用光谱功率分布法预测LED灯的流明和色度维持寿命

2015 12th China International Forum on Solid State Lighting (SSLCHINA) Pub Date : 2015-12-21 DOI: 10.1109/SSLCHINA.2015.7360691

C. Qian, J. J. Fan, X. Fan, A. Chernyakov, G. Zhang

{"title":"Lumen and chromaticity maintenance lifetime prediction for LED lamps using a spectral power distribution method","authors":"C. Qian, J. J. Fan, X. Fan, A. Chernyakov, G. Zhang","doi":"10.1109/SSLCHINA.2015.7360691","DOIUrl":"https://doi.org/10.1109/SSLCHINA.2015.7360691","url":null,"abstract":"In this study, a spectral power distribution (SPD) based method is developed to analyze and predict reliability characteristics of Light Emitting Diode (LED) lamps, such as lumen and chromaticity maintenance lifetimes. Usually, an entire SPD of a LED lamp can be regarded as the superposition of an asymmetric blue with a phosphor converted spectrum, each of which can be fitted by an Asymmetric Gaussian (AGaussian) model. During the ageing process, the decomposed SPD model parameters extracted from the test data of a LED lamp are fitted further to an exponential degradation model. Then at any given time, the lumen maintenance φ and color coordinates u' and v' can be calculated by predicting the SPD of a LED lamp. In order to demonstrate the application of the proposed method, a batch of ten LED PAR20 lamps equipped with four phosphor converted white LEDs (pc-white LEDs) were aged at 25 °C for 4000 hours. And a statistical analysis was performed to calculate the median values (50 percentile) of φ and du'v' with both upper boundary (5 percentile) and lower boundary (95 percentile). The results show that most of the measured φ and du'v' can be enveloped within the lower boundary curves predicted by the proposed model. In addition, there is a good prediction result of the φ curves by using the proposed method and a published statistical method. At last, the comparison between lumen and chromaticity maintenance lifetime predictions shows that the luminous flux depreciation failure may be the primary concern than the color shift in the selected test samples.","PeriodicalId":331882,"journal":{"name":"2015 12th China International Forum on Solid State Lighting (SSLCHINA)","volume":"4 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2015-12-21","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"134222629","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: 9

LED aging acceleration — An analysis from measuring and aging data of 14,000 hours LED degradation LED老化加速-对14000小时LED退化的测量和老化数据的分析

2015 12th China International Forum on Solid State Lighting (SSLCHINA) Pub Date : 2015-12-21 DOI: 10.1109/SSLCHINA.2015.7360693

Max Wagner, A. Herzog, H. Ganev, T. Khanh

引用次数: 4

Temperature independence of the droop effect in blue LED's grown on silicon substrates 在硅衬底上生长的蓝色LED的下垂效应的温度无关性

2015 12th China International Forum on Solid State Lighting (SSLCHINA) Pub Date : 2015-12-21 DOI: 10.1109/SSLCHINA.2015.7360685

P. Tanner, J. Han, S. Dimitrijev

引用次数: 0

Comparative analysis of thermal and optical properties for the LEDs with different circuit boards 不同电路板对led的热光学性能的比较分析

2015 12th China International Forum on Solid State Lighting (SSLCHINA) Pub Date : 2015-12-21 DOI: 10.1109/SSLCHINA.2015.7360695

Jiajia Fu, Haizhong Xie, H. Cao, Lixia Zhao, Xuejiao Sun, Baojun Sun, Junxi Wang, Jinmin Li

引用次数: 1

Reliability excellence in SSL manufacturing 可靠性卓越的SSL制造

2015 12th China International Forum on Solid State Lighting (SSLCHINA) Pub Date : 2015-11-01 DOI: 10.1109/SSLCHINA.2015.7360692

G. Tao

引用次数: 0

The impact of ambient illumination on visual fatigue while watching TV 看电视时环境光照对视觉疲劳的影响

2015 12th China International Forum on Solid State Lighting (SSLCHINA) Pub Date : 2015-11-01 DOI: 10.1109/SSLCHINA.2015.7360709

Lili Wang, Y. Tu, Lanlan Yang, Yanyan Chen

引用次数: 2

Low turn-on voltage AlGaN/GaN SBD designed by cascode 低导通电压AlGaN/GaN SBD设计

2015 12th China International Forum on Solid State Lighting (SSLCHINA) Pub Date : 2015-11-01 DOI: 10.1109/SSLCHINA.2015.7360714

Lifang Jia, Zhi He, Yanan Liang, Zhongchao Fan, Yun Zhang, Fuhua Yang, Junxi Wang

引用次数: 0

Design of greenhouse monitoring and control system based on LED lighting 基于LED照明的温室监控系统设计

2015 12th China International Forum on Solid State Lighting (SSLCHINA) Pub Date : 2015-11-01 DOI: 10.1109/SSLCHINA.2015.7360704

Yanyan Li, Pingjuan Niu, Zhengxiao Su

{"title":"Design of greenhouse monitoring and control system based on LED lighting","authors":"Yanyan Li, Pingjuan Niu, Zhengxiao Su","doi":"10.1109/SSLCHINA.2015.7360704","DOIUrl":"https://doi.org/10.1109/SSLCHINA.2015.7360704","url":null,"abstract":"LED light source module is developed according to the design of light distribution of RRGB chip based on the demand of plants for light, temperature and humidity. Several light source modules constitute LED array planar light source module. Monitoring and control of the system is realized through the combination of upper computer based on LabVIEW and controller. The controller conducts real-time detection on photon flux density (PFD) of red, green and blue bands, temperature and humidity and displays the detection information on the interface of upper computer. Pulse width modulation (PWM) signal is adjusted dynamically through the controller so as to make PFD value of plants under lighting remain constant, thus realizing intelligent fill lighting of the lighting system in combination with ambient light. Meanwhile, the system also realizes intelligent adjustment of temperature and humidity threshold range. This intelligent fill lighting system meets the requirement of plants for fill lighting environment and greatly saving energies through the setting of different PFD values and temperature and humidity ranges of red, green and blue bands by upper computer and the completion of environmental control by lower computer according to the setting based on different fill lighting demands of different plants or the same plant in different growth stages for PFD and light quality ratio.","PeriodicalId":331882,"journal":{"name":"2015 12th China International Forum on Solid State Lighting (SSLCHINA)","volume":"344 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2015-11-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"115885367","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: 3

A study on lighting uniformity for LED smart lighting system LED智能照明系统照明均匀性研究

2015 12th China International Forum on Solid State Lighting (SSLCHINA) Pub Date : 2015-11-01 DOI: 10.1109/SSLCHINA.2015.7360705

Yu Hu, M. Luo, Yang Yang

引用次数: 9

A new sturcture AlGaN/GaN HEMT 一种新型的AlGaN/GaN HEMT结构

2015 12th China International Forum on Solid State Lighting (SSLCHINA) Pub Date : 2015-11-01 DOI: 10.1109/SSLCHINA.2015.7360713

Zhe Cheng, Yun Zhang

{"title":"A new sturcture AlGaN/GaN HEMT","authors":"Zhe Cheng, Yun Zhang","doi":"10.1109/SSLCHINA.2015.7360713","DOIUrl":"https://doi.org/10.1109/SSLCHINA.2015.7360713","url":null,"abstract":"In several decades, the world has witnessed various dramatic changes since applying of semiconductor. The performance requirements of semiconductor products are continue increasing while the technology is improving. In order to satisfy the requirements, the researches of new material and device structure is necessary. This paper shows a new structure of GaN HEMT. An AlGaN/GaN HEMT consists of AlGaN/GaN Heterojunction, drain electrode, source electrode and gate electrode. Though the researchers have reported a large number of HEMT structures since M. Asif Khan and his colleagues repot the first AlGaN/GaN HEMT in 1993, there is none of the structures, which three electrodes are in different surfaces of device. This paper describes a new structure called different-surface-gate structure, which drain and source electrodes are on the other surface while the gate electrode is on the top surface (AlGaN surface) of the device as normal HEMTs. This paper will establish two models by TCAD simulation software. One is the model of different-surface-gate AlGaN/GaN HEMT and the other one is normal structure AlGaN/GaN HEMT, which is the control model. After building the models, the compare of the models will show the saturation current of the different-surface-gate model is 120% as large as it of the other model.","PeriodicalId":331882,"journal":{"name":"2015 12th China International Forum on Solid State Lighting (SSLCHINA)","volume":"137 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2015-11-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"127570605","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