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

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Will the blue light at night in lamp and screen destroy East Asians? 晚上灯和屏幕上的蓝光会毁灭东亚人吗?
2016 13th China International Forum on Solid State Lighting (SSLChina) Pub Date : 2016-11-01 DOI: 10.1109/SSLCHINA.2016.7804362
Wenqing Fang, Kaiqi Fang, Yuehui Zheng, Chunlan Mo, Chaopu Yang, Chang-da Zheng, Chuangbing Xiong
{"title":"Will the blue light at night in lamp and screen destroy East Asians?","authors":"Wenqing Fang, Kaiqi Fang, Yuehui Zheng, Chunlan Mo, Chaopu Yang, Chang-da Zheng, Chuangbing Xiong","doi":"10.1109/SSLCHINA.2016.7804362","DOIUrl":"https://doi.org/10.1109/SSLCHINA.2016.7804362","url":null,"abstract":"Will the blue light at night in lamp and screen destroy East Asians? How to avoid it? Along the axis of light-melatonin-reproduction, this paper summarized a theoretical model related to the influence of modern lighting and display on human reproduction from literature and then finds out six possible proofs for this model from the history of humans' exposures to light at night. Although these proofs may all have some loopholes, the four standards for healthy light ray at night proposed by this paper only imitate the nature, namely they are tenable even without these proofs. This paper also have measured the proportion of blue light in various light sources, and have evaluated their influences on reproduction; meanwhile, this paper also has proposed concrete solutions and even has developed relevant LED lamps; At last, some suggestions and warnings were offered.","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":"131059758","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
Self-adaptive remote phosphor layer for PC-WLEDs with vertical chip 基于垂直芯片的pc - wled自适应远程荧光粉层
2016 13th China International Forum on Solid State Lighting (SSLChina) Pub Date : 2016-11-01 DOI: 10.1109/SSLCHINA.2016.7804337
Kun Zhang, Haibo Rao, Qinghao Meng, Tingting Li, Weibing Zheng
{"title":"Self-adaptive remote phosphor layer for PC-WLEDs with vertical chip","authors":"Kun Zhang, Haibo Rao, Qinghao Meng, Tingting Li, Weibing Zheng","doi":"10.1109/SSLCHINA.2016.7804337","DOIUrl":"https://doi.org/10.1109/SSLCHINA.2016.7804337","url":null,"abstract":"In this paper, we have demonstrated a self-adaptive remote phosphor coating method in pc-white LED with vertical chips. With this method, the phosphor layer is separated from LED chip at a distance, so that the extraction efficiency of blue light is enhanced, and the luminous efficiency is increased about 16%, compared with the conventional phosphor coating. With the self-adaptive remote phosphor coating method, the profile (thickness and shape) of phosphor coating layer matched with the angular intensity distribution of blue light emitted by LED chips is realized. The experimental results have verified the remote phosphor coating structure shows very high spatial color homogeneity (SCH) performance, that is, extremely small angular correlated color temperature (CCT) deviations were obtained, which are 206K at average CCT of 4600K.","PeriodicalId":413080,"journal":{"name":"2016 13th China International Forum on Solid State Lighting (SSLChina)","volume":"162 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":"121386915","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
A study on the application of quantum dots film in COB 量子点薄膜在COB中的应用研究
2016 13th China International Forum on Solid State Lighting (SSLChina) Pub Date : 2016-11-01 DOI: 10.1109/SSLCHINA.2016.7804344
Jingjing Li, Xibing Hu
{"title":"A study on the application of quantum dots film in COB","authors":"Jingjing Li, Xibing Hu","doi":"10.1109/SSLCHINA.2016.7804344","DOIUrl":"https://doi.org/10.1109/SSLCHINA.2016.7804344","url":null,"abstract":"In recent years, application of quantum dots (QDs) have attracted intensive interest owing to their outstanding photoluminescence properties, All of these attractive characteristics make QDs candidates for the next generation back-lighting and display. However, the commercial application in lighting, especially in integrated devices is seldom reported. In this work, we used QDs film in chip on board (COB) as color converter, and compared the performance with traditional phosphor. Results revealed that though many advantages, a lot of problems required to be overcome for QDs film, such as thermal stability, process control, luminous efficacy (LE), spectral distribution, color rendering index (CRI) and so on.","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":"128780826","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
Safety production based LED light system design for plant factories 基于安全生产的植物工厂LED照明系统设计
2016 13th China International Forum on Solid State Lighting (SSLChina) Pub Date : 2016-11-01 DOI: 10.1109/SSLCHINA.2016.7804360
Chenjun Yan, Hong Zhou, Jingyue Li
{"title":"Safety production based LED light system design for plant factories","authors":"Chenjun Yan, Hong Zhou, Jingyue Li","doi":"10.1109/SSLCHINA.2016.7804360","DOIUrl":"https://doi.org/10.1109/SSLCHINA.2016.7804360","url":null,"abstract":"Plant factory is a kind of efficient agriculture system, through high-precision computer control system, it brings plants suitable temperature, humidity, illumination and concentrations of carbon dioxide. LED light system based on red and blue light has already been applied into plant factory, aiming at providing suitable illumination for plants. To avoid the harm of blue ray to human eyes and skin, we provides a kind of light system for plant factory based on LED with blue, red and green light. The system adopts STM32 as the main control chip, and uses the PWM technology to regulate the LED light intensity. The system has two modes, manual operation mode and plant growth mode, it can switch its working mode automatically. The key difference between these two modes is the existence of blue ray. Since blue ray does harm to human eyes and skin, when people expose to the working environment, the system will turn to manual operation mode which weakens blue ray. At other times, system will go on the plant growth mode. The system can also detect the environmental parameters and adjust the required illumination parameters to fit plant growth in different life cycle. Furthermore, ZIGBEE technique has been used as network connection solution for large plant factory. From the experiments we have conducted, our system achieved satisfying performance, it realizes safety production of the LED light system for plant factory.","PeriodicalId":413080,"journal":{"name":"2016 13th China International Forum on Solid State Lighting (SSLChina)","volume":"37 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":"116980133","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
Effect of LED spectra of different saturating levels on the color preference of red makeup products 不同饱和度LED光谱对红色彩妆产品色彩偏好的影响
2016 13th China International Forum on Solid State Lighting (SSLChina) Pub Date : 2016-11-01 DOI: 10.1109/SSLCHINA.2016.7804363
P. Bodrogi, T. Khanh
{"title":"Effect of LED spectra of different saturating levels on the color preference of red makeup products","authors":"P. Bodrogi, T. Khanh","doi":"10.1109/SSLCHINA.2016.7804363","DOIUrl":"https://doi.org/10.1109/SSLCHINA.2016.7804363","url":null,"abstract":"Reddish cosmetics products (e.g. skin-tone powders or red lipsticks) are important for the LED lighting of beauty shops and TV or film productions. In our visual experiment, subjects had to assess their color preference, naturalness, and vividness impression of such cosmetics products viewed with seven different multi-LED spectra of a six-channel LED illuminating system at 3200 K and 500 l×. It was found that1. a multi-LED spectrum with a maximum color rendering index does not guarantee best visual color preference, naturalness or vividness assessments;2. a quantity describing object oversaturation (e.g. a color gamut index) is a better descriptor; and 3. if over-saturation exceeds a certain limit then observers will not prefer these reddish cosmetic products any more.","PeriodicalId":413080,"journal":{"name":"2016 13th China International Forum on Solid State Lighting (SSLChina)","volume":"14 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":"134201435","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
Atmosphere perception of LED dynamic lighting with color varied in cool and warm hue LED动态照明的氛围感与色彩的冷暖色调变化
2016 13th China International Forum on Solid State Lighting (SSLChina) Pub Date : 2016-11-01 DOI: 10.1109/SSLCHINA.2016.7804365
Bing Li, Qiyan Zhai, Ronnier M. Luo, Fangtian Ying
{"title":"Atmosphere perception of LED dynamic lighting with color varied in cool and warm hue","authors":"Bing Li, Qiyan Zhai, Ronnier M. Luo, Fangtian Ying","doi":"10.1109/SSLCHINA.2016.7804365","DOIUrl":"https://doi.org/10.1109/SSLCHINA.2016.7804365","url":null,"abstract":"Take the perspective of cool hue and warm hue, this paper investigated atmosphere perception of LED dynamic colored lighting, as well as physical parameters effects. An experiment was carried out in a LED lighting lab with 8 fully functioned LED cubes, which can produce temporal color-varied lighting. 30 Chinese observers (14 males, 16 females, mean age=25.43, SD= 2.86) evaluated 36 Light conditions (2 lightness levels × 2 chroma levels × 3 hue range types × 3 speed) with 25 word pairs questionnaire. 4 atmosphere dimensions were extracted as coziness, soberness, liveliness and warmness. High speed and high chroma is helpful to create liveliness; low speed and low chroma is more cozy. Warm hue range makes intimate and warm space; cool hue range usually increase soberness. Differences caused by gender and design background were also found.","PeriodicalId":413080,"journal":{"name":"2016 13th China International Forum on Solid State Lighting (SSLChina)","volume":"10 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":"131492434","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: 2
Effect of the surface curvature of the phosphor layer on the optical performance of a WLED 荧光粉层表面曲率对WLED光学性能的影响
2016 13th China International Forum on Solid State Lighting (SSLChina) Pub Date : 2016-11-01 DOI: 10.1109/SSLCHINA.2016.7804341
Jiaqi Wang, S. Lee, Huayong Zou
{"title":"Effect of the surface curvature of the phosphor layer on the optical performance of a WLED","authors":"Jiaqi Wang, S. Lee, Huayong Zou","doi":"10.1109/SSLCHINA.2016.7804341","DOIUrl":"https://doi.org/10.1109/SSLCHINA.2016.7804341","url":null,"abstract":"In this study, the influence of the surface curvature of the phosphor layer on the optical performance of white light-emitting diodes (WLEDs) was investigated. Based on the lead frame of a standard 3528 component, WLEDs with various phosphor layer structures were fabricated for investigation. The curvature of the phosphor layer was adjusted by the volume of phosphor slurry. The consumption of phosphor materials was chosen as a control parameter for different structures in the present study. Both ray-tracing simulation and experimental investigations were performed to characterize the optical performance of the WLEDs. The relationship between the central height of the phosphor layer and the optical performance of WLEDs was analyzed in order to find the optimized structure.","PeriodicalId":413080,"journal":{"name":"2016 13th China International Forum on Solid State Lighting (SSLChina)","volume":"15 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":"115593434","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
Investigation of output nonlinearity mechanisms in gan-based blue laser diodes 氮化镓基蓝色激光二极管输出非线性机理研究
2016 13th China International Forum on Solid State Lighting (SSLChina) Pub Date : 2016-11-01 DOI: 10.1109/SSLCHINA.2016.7804336
Yin-Lin Huang, P. Wen, Deyao Li, Jianping Liu, M. Ikeda, Junlei He, Shuming Zhang, Li-qun Zhang, Hui Yang
{"title":"Investigation of output nonlinearity mechanisms in gan-based blue laser diodes","authors":"Yin-Lin Huang, P. Wen, Deyao Li, Jianping Liu, M. Ikeda, Junlei He, Shuming Zhang, Li-qun Zhang, Hui Yang","doi":"10.1109/SSLCHINA.2016.7804336","DOIUrl":"https://doi.org/10.1109/SSLCHINA.2016.7804336","url":null,"abstract":"A nonlinearity mechanism in GaN-based blue laser diodes (LDs) has been studied by light-current (L-I) measurement under different pulse width, the experiments and simulation results verified that the nonlinearity is caused by mode changing resulting from temperature distribution difference for different cavity length. Nonuniformity of temperature distribution along the ridge leads to the diversity of confinement factors of the ridge waveguide which inducing poor waveguide stability. We concluded that long cavity length could improve the linearity of our LDs by decreasing temperature difference and thermal resistance.","PeriodicalId":413080,"journal":{"name":"2016 13th China International Forum on Solid State Lighting (SSLChina)","volume":"56 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":"114570794","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 improvement of the luminous efficacy of LED chips by a pre-treatment process before annealing process on ITO films deposited by magnetron sputtering 在磁控溅射沉积的ITO薄膜上进行退火前预处理，提高了LED芯片的发光效率
2016 13th China International Forum on Solid State Lighting (SSLChina) Pub Date : 2016-11-01 DOI: 10.1109/SSLCHINA.2016.7804339
L. Yin, T. Han, Z. H. Wu, J. B. Wang
{"title":"The improvement of the luminous efficacy of LED chips by a pre-treatment process before annealing process on ITO films deposited by magnetron sputtering","authors":"L. Yin, T. Han, Z. H. Wu, J. B. Wang","doi":"10.1109/SSLCHINA.2016.7804339","DOIUrl":"https://doi.org/10.1109/SSLCHINA.2016.7804339","url":null,"abstract":"Indium Tin Oxide (ITO) films deposited by magnetron sputtering are widely used as transparent conducting layers for InGaN based light-emitting diodes (LEDs). Compared to ITO films deposited by electron beam evaporation, tthe ITO films deposited by magnetron sputtering typically have higher optical transmittance and greater electrical conductivities, which can result in higher efficiency for LEDs. However, the surface of LEDs could be damaged due to bombarding of highly energetic ITO particles during magnetron sputtering, which can cause a higher ITO/p-GaN contact resistance. In addition, the n-electrode/n-GaN contact can also be affected by different ITO treatment processes. Therefore, there is still a need to optimize the ITO deposition and treatment processes to minimize the working voltage In this work, the relationship of the ohmic contacts of ITO/p-GaN and n-electrode/n-GaN with ITO deposition and treatment process have been investigated in details, by Circle Transport Line method (CTLM) and Transport Line method (TLM). It is found that a special pre-treatment process for magnetron sputtering ITO films can reduce the working voltage by 0.1V compared to the conventional processes by further lowering the n-electrode/n-GaN contact resistivity. This work can help further improve the luminous efficacy of white LEDs especially in the high power working conditions.","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":"114584109","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
Reliability optimization of gold-tin eutectic die attach layer in HEMT package HEMT封装中金-锡共晶贴片层可靠性优化
2016 13th China International Forum on Solid State Lighting (SSLChina) Pub Date : 2016-11-01 DOI: 10.1109/SSLCHINA.2016.7804349
Hao Zhang, Jiajie Fan, Jing Zhang, C. Qian, Xuejun Fan, F. Sun, Guoqi Zhang
{"title":"Reliability optimization of gold-tin eutectic die attach layer in HEMT package","authors":"Hao Zhang, Jiajie Fan, Jing Zhang, C. Qian, Xuejun Fan, F. Sun, Guoqi Zhang","doi":"10.1109/SSLCHINA.2016.7804349","DOIUrl":"https://doi.org/10.1109/SSLCHINA.2016.7804349","url":null,"abstract":"This paper compared the fatigue damage accumulation of the gold-tin eutectic die attach layer in different high electron mobility transistor (HEMT) packages with various types of die attach layers and substrates under thermal cyclic loading. The fatigue damage per cycle used in this study was characterized by the accumulation of plastic work, which was derived by the finite element analysis (FEA). The effects of die attach layer's standoff height and thickness of substrate on fatigue damage accumulation was discussed. The results show that increasing the standoff height of the die attach layer is an effective way to prevent the early crack initiation in gold-tin die attach layer especially for a gallium nitride (GaN) die. It is also indicated that for a GaN die, a thicker die attach layer and a thinner substrate are preferable in order to retain a comparable lifetime with silicon (Si) die and Cu substrate system.","PeriodicalId":413080,"journal":{"name":"2016 13th China International Forum on Solid State Lighting (SSLChina)","volume":"146 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":"122721464","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: 2
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