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Quantum dots (QDs) have recently attracted intensive research interest with their advantage optical properties and easy processing in micro/mini-LED applications. However, integrating QDs into LED packaging still faces critical challenges of fluorescent quenching and thermal-induced degradation. In this report, we investigated the QDs concentration related fluorescent quenching and the positive ro...Show More
Spectral Design Considerations of White LED for Classroom Application
Jay Guoxu Liu;Hongyuan Zhu;Lei Zhu;Chongyu Shen;Ruping Zheng;Yousan Chen;Jianxing Xu
The improved efficiency of Phosphor-converted white LED devices and fixtures along with the significant cost down effort have led to tremendous market growth in almost every lighting application. However, the high-energy blue proportion of phosphor-converted white LED has raised concern about photochemically induced retinal damages. For applications such as classroom lighting, the blue light hazar...Show More
Influence of the Charge Transfer on the Lifetime of Quantum-Dot Light-Emitting Diodes
Yue Liang;Chongyu Shen;Junfei Chen;Weiye Zheng;Zheng Xu;Jay Guoxu Liu
The operating lifetime of quantum-dot light-emitting diodes (QLEDs) is a critical parameter for quantum-dot display which is becoming an emerging display technology. To pinpoint the causes of device degradation, we demonstrated an enhanced reliability of all-solution processed QLEDs by introducing an insulating interfacial layer between the ETL and the QDs. It is confirmed that a PMMA interfacial ...Show More
Violet Chip Excited White LEDs for Sun-Like Lighting and Horticulture Lighting
2019 16th China International Forum on Solid State Lighting & 2019 International Forum on Wide Bandgap Semiconductors China (SSLChina: IFWS)
Year: 2019 | Conference Paper |
Cited by: Papers (2)
With the latest progress in new generation of phosphor and packaging design, full spectrum, sun-like white LEDs become possible. We have developed such light sources by using a 410nm violet chip to excite a set of phosphors of blue, cyan, green and red, and then fine tune the spectrum power distribution (SPD). High color quality properties such as Ra of 98, Rg of 98 and Rf of 100 were achieved. Wi...Show More
Thermal Analysis and Performance Optimization of Quantum Dots in LEDs by Microsphere Model
Dongdong Yang;Yangyang Xie;Chong Geng;Chongyu Shen;Jay Guoxu Liu;Mingzhu Sun;Shanshan Li;Wengang Bi;Shu Xu
Quantum dots (QDs) have aroused intensive research interest because of their unique optical properties and capability in the fabrication of high-performance light-emitting diodes (LEDs). However, the optical performance of the QDs is strongly affected by their intrinsic thermal sensitivity as well as the dispersion state in LEDs, thus demanding more accurate thermal control of the QDs in the LED p...Show More
With the improved efficiency of LED light sources and fast cost reduction in recent years, LED light sources have entered into indoor urban agriculture and vertical farming. At present, LED light sources for horticulture lighting have two main approaches to achieve required light spectra, one is monochromatic LED package and the other LED package with mixed spectra of phosphor converted light. Thi...Show More
Quantitative Analysis of Full Spectrum LEDs for High Quality Lighting
2018 15th China International Forum on Solid State Lighting: International Forum on Wide Bandgap Semiconductors China (SSLChina: IFWS)
Year: 2018 | Conference Paper |
Cited by: Papers (1)
With the latest progress in new generation of phosphor and packaging design, higher quality, full spectrum, white LEDs become possible. By engineering the spectrum power distribution (SPD), we have developed full spectrum light sources and proposed methods for evaluating thelight sources' color quality, spectral continuity, and eye-safety. The spectral continuity, which is termed as Cs, quantifies...Show More
With the advanced formulation of new phosphors and latest progress in packaging design, technologies to obtain the higher color quality and healthier white LEDs are investigated. The luminescent properties were characterized by the spectrum power distribution (SPD) and IES TM-30-15. By engineering the SPD of white LEDs using advanced phosphor formulation and package design, we developed light sour...Show More
Advances in higher color quality and healthier white LEDs
2017 14th China International Forum on Solid State Lighting: International Forum on Wide Bandgap Semiconductors China (SSLChina: IFWS)
Year: 2017 | Conference Paper |
Cited by: Papers (5)
With the advanced formulation of new phosphors and latest progress in packaging design, several technologies to obtain the higher color quality and healthierwhite LEDs are investigated. By engineering the spectrum power distribution (SPD), we developed LEDs that emulates reference light sources such as daylight and incandescent light. These LEDs exhibit qualities closest to daylight with high CRI,...Show More
Tunable LED modules based on CSP-COB
Chongyu Shen;Jianqing Shi;Jiangen Zhao;Wei Tang;Guoxi Sun;Jay GuoxuLiu
Research has indicated the correlation between color of light sources and human circadian cycle. Color tuning to environmental needs has become more and more important in high quality lighting applications. A perfect spectrum of light should exhibit qualities closest to sunlight with high CRI, but is ideally attuned to human sensitivity. A human centric light (HCL) needs to be engineered according...Show More
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