Pub Date : 2019-11-01DOI: 10.1109/SSLChinaIFWS49075.2019.9019796
Fanny Zhao, Brian Shieh, Fangyun Zeng, Guoming Yang, S. R. Ricky Lee
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.
led的结温对其寿命、可靠性和效率有着重要的影响。现有的利用瞬态热测试仪(T3ster)基于JESD51-14的恒偏置电流时间分辨测量的结温瞬态测量方法，能够根据已知的恒温模块作为散热器的温度，获得LED结温升。在实际应用中，在没有T3ster和恒温模块的情况下，对于灯具中有多个热源的多led模块，需要建立热阻矩阵来实现彼此之间的热传递，从而通过其热功耗计算其结温升。结果表明，在不测量温度散热器温度的情况下，在PCB上带有热敏电阻(NTC或PTC)测量局部参考温度的多LED模块中，LED(组)的单个结温可以从具有N个LED热源和N+1个结温升的修正N x (N+1)热阻矩阵中获得。在5种不同的环境温度和2种不同的功率组合下，使用3种不同环境温度下的3种热阻矩阵进行比较，研究了3组led的多led模块样本。结果表明，在20~100℃的局部参考温度范围内，改进后的方法可以有效方便地测量多led模块的结温，精度与传统方法相近。
{"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}
This paper introduces three kinds of high power density light sources which are independently designed. Two of them use ceramic substrate and flip chip. Another one use metal substrate and lateral structure chip. The tests of their light efficiency, color temperature and color rendering index are conducted. After that, the three kinds of light sources are lighten for 1500 hours at the environment temperature of 55°C. After the aging test, the parameters such as light efficiency, color temperature and color rendering index are recorded. All the data are compared at the end of the paper.
{"title":"Study on high power density light-emting diodes light source","authors":"Huaiwen Zheng, Junxi Wang, Jinmin Li, Zhonghua Deng, Zhuguang Liu, Fei Yu, Yan Li, Yuming Yang, Qiao Liang, Hua Yang, X. Yi","doi":"10.1109/SSLChinaIFWS49075.2019.9019774","DOIUrl":"https://doi.org/10.1109/SSLChinaIFWS49075.2019.9019774","url":null,"abstract":"This paper introduces three kinds of high power density light sources which are independently designed. Two of them use ceramic substrate and flip chip. Another one use metal substrate and lateral structure chip. The tests of their light efficiency, color temperature and color rendering index are conducted. After that, the three kinds of light sources are lighten for 1500 hours at the environment temperature of 55°C. After the aging test, the parameters such as light efficiency, color temperature and color rendering index are recorded. All the data are compared at the end of the paper.","PeriodicalId":315846,"journal":{"name":"2019 16th China International Forum on Solid State Lighting & 2019 International Forum on Wide Bandgap Semiconductors China (SSLChina: IFWS)","volume":"60 3","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2019-11-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"114041742","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}
Pub Date : 2019-11-01DOI: 10.1109/SSLChinaIFWS49075.2019.9019798
T. Zheng, Wujun, Zhixian Zhou, Wanghui Yan
Smart lighting technologies are very important for high illumination quality and energy-efficiency. In this article, lighting performance controlled by color sensor module has been studied. With simplified system architecture and effective algorithm, the module can be used to obtain precise color and light characteristics for a target area, which can help to tune the specific color rendering property and the intensity of illuminance to an appropriate level automatically for different lighting scenarios. The balance between color preference and color fidelity can be achieved easily with suitable transformation program, and the illuminance information offers a route for governing lighting in high energy-efficiency.
{"title":"Smart Lighting with Autonomous Color Tunability","authors":"T. Zheng, Wujun, Zhixian Zhou, Wanghui Yan","doi":"10.1109/SSLChinaIFWS49075.2019.9019798","DOIUrl":"https://doi.org/10.1109/SSLChinaIFWS49075.2019.9019798","url":null,"abstract":"Smart lighting technologies are very important for high illumination quality and energy-efficiency. In this article, lighting performance controlled by color sensor module has been studied. With simplified system architecture and effective algorithm, the module can be used to obtain precise color and light characteristics for a target area, which can help to tune the specific color rendering property and the intensity of illuminance to an appropriate level automatically for different lighting scenarios. The balance between color preference and color fidelity can be achieved easily with suitable transformation program, and the illuminance information offers a route for governing lighting in high energy-efficiency.","PeriodicalId":315846,"journal":{"name":"2019 16th China International Forum on Solid State Lighting & 2019 International Forum on Wide Bandgap Semiconductors China (SSLChina: IFWS)","volume":"89 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":"114068403","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}
Pub Date : 2019-11-01DOI: 10.1109/SSLChinaIFWS49075.2019.9019780
Yi Wen, Xiaojie Xu, Hao Zhu, Xuan Li, Xiaochuan Deng, Fei Yang, Jun-tao Li, Bo Zhang
For ultra-high voltage SiC devices of 10kV and above, the length of conventional FLR even reaches up to millimeters, which impedes the miniaturization and development in ultra-high voltage applications. In this paper, a novel termination structure of the Etching Uniform Field Limiting Ring (EU-FLR) for 10kV SiC power device is proposed and analyzed based on the theory of charge field modulation. The blocking capability achieves at 14.2kV and the EU-FLR exhibits a reduction of more than 30% in size compared with the conventional FLRs. The voltage efficiency factor η1 of EU-FLR is 90% and the area efficiency factor η2 is 17.8V/μm, respectively. The influence of the pivotal structural parameters of EU-FLRs on termination protection efficiency has been analyzed and researched by TCAD Silvaco.
{"title":"Design and Characteristics of an Etching Field Limiting Ring for 10kV SiC Power Device","authors":"Yi Wen, Xiaojie Xu, Hao Zhu, Xuan Li, Xiaochuan Deng, Fei Yang, Jun-tao Li, Bo Zhang","doi":"10.1109/SSLChinaIFWS49075.2019.9019780","DOIUrl":"https://doi.org/10.1109/SSLChinaIFWS49075.2019.9019780","url":null,"abstract":"For ultra-high voltage SiC devices of 10kV and above, the length of conventional FLR even reaches up to millimeters, which impedes the miniaturization and development in ultra-high voltage applications. In this paper, a novel termination structure of the Etching Uniform Field Limiting Ring (EU-FLR) for 10kV SiC power device is proposed and analyzed based on the theory of charge field modulation. The blocking capability achieves at 14.2kV and the EU-FLR exhibits a reduction of more than 30% in size compared with the conventional FLRs. The voltage efficiency factor η1 of EU-FLR is 90% and the area efficiency factor η2 is 17.8V/μm, respectively. The influence of the pivotal structural parameters of EU-FLRs on termination protection efficiency has been analyzed and researched by TCAD Silvaco.","PeriodicalId":315846,"journal":{"name":"2019 16th China International Forum on Solid State Lighting & 2019 International Forum on Wide Bandgap Semiconductors China (SSLChina: IFWS)","volume":"121 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":"114510898","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}
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.
{"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}
Pub Date : 2019-11-01DOI: 10.1109/SSLChinaIFWS49075.2019.9019752
Sijie He, Jinrong Liu, Shuo Jing, Yandan Lin
With the continuous development of EMU technology, the role of light rail trains in cities is becoming more and more important. A good overall light environment is of great significance for the safe and efficient operation of light rail trains. This experiment is based on the purpose of exploring the evaluating the train light environment method. In this study, we adopted the method of first using optical software DIALux and TracePro simulation, then conducting physical test and subsequent ergonomics experimental verification. By comparing the simulation results with the experimental results, we gave the suggestion about the final evaluation of the train light environment. It is hoped that the results of this study will provide a scientific method and basis for the design of the light environment of the train cab and passenger compartment in the future.
{"title":"Research on train light environment evaluation method","authors":"Sijie He, Jinrong Liu, Shuo Jing, Yandan Lin","doi":"10.1109/SSLChinaIFWS49075.2019.9019752","DOIUrl":"https://doi.org/10.1109/SSLChinaIFWS49075.2019.9019752","url":null,"abstract":"With the continuous development of EMU technology, the role of light rail trains in cities is becoming more and more important. A good overall light environment is of great significance for the safe and efficient operation of light rail trains. This experiment is based on the purpose of exploring the evaluating the train light environment method. In this study, we adopted the method of first using optical software DIALux and TracePro simulation, then conducting physical test and subsequent ergonomics experimental verification. By comparing the simulation results with the experimental results, we gave the suggestion about the final evaluation of the train light environment. It is hoped that the results of this study will provide a scientific method and basis for the design of the light environment of the train cab and passenger compartment in the future.","PeriodicalId":315846,"journal":{"name":"2019 16th China International Forum on Solid State Lighting & 2019 International Forum on Wide Bandgap Semiconductors China (SSLChina: IFWS)","volume":"185 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":"134120614","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}
Pub Date : 2019-11-01DOI: 10.1109/SSLChinaIFWS49075.2019.9019792
Xiaoling Hu, Wensha Lan
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.
{"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}
Pub Date : 2019-11-01DOI: 10.1109/sslchinaifws49075.2019.9019779
{"title":"SSLChina: IFWS 2019 Cover Page","authors":"","doi":"10.1109/sslchinaifws49075.2019.9019779","DOIUrl":"https://doi.org/10.1109/sslchinaifws49075.2019.9019779","url":null,"abstract":"","PeriodicalId":315846,"journal":{"name":"2019 16th China International Forum on Solid State Lighting & 2019 International Forum on Wide Bandgap Semiconductors China (SSLChina: IFWS)","volume":"10 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":"121730335","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}
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.
{"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}
Perovskite material has been widely researched for illumination. Since its shorter PL lifetime (nanosecond), compared with the traditional illumination phosphor (microsecond), perovskite has been considered as a promising material for communication. In this work, by ultrasonication, we synthesized the CsPbBr3 perovskite quantum dots and found that liquid perovskite quantum dots (LPQDs) presents shorter luminescence lifetime of 24ns than solid state perovskite (SPQDs). We demonstrated a white visible light communication (VLC) system by using the LPQDs as a color converter. The LD-based white lighting VLC system can reach a 1Gbps data rate at a receivable BER. Our study indicates that LPQDs has great potential in communication performance.
{"title":"Perovskite liquid quantum dots as a color converter for LD-based white lighting system for visible light communication","authors":"Shunming Liang, Zhou Lu, Xinrui Ding, Jiexin Li, Yong Tang, Zongtao Li, Binhai Yu","doi":"10.1109/SSLChinaIFWS49075.2019.9019760","DOIUrl":"https://doi.org/10.1109/SSLChinaIFWS49075.2019.9019760","url":null,"abstract":"Perovskite material has been widely researched for illumination. Since its shorter PL lifetime (nanosecond), compared with the traditional illumination phosphor (microsecond), perovskite has been considered as a promising material for communication. In this work, by ultrasonication, we synthesized the CsPbBr3 perovskite quantum dots and found that liquid perovskite quantum dots (LPQDs) presents shorter luminescence lifetime of 24ns than solid state perovskite (SPQDs). We demonstrated a white visible light communication (VLC) system by using the LPQDs as a color converter. The LD-based white lighting VLC system can reach a 1Gbps data rate at a receivable BER. Our study indicates that LPQDs has great potential in communication performance.","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":"121571154","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}
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