Session Index

Our design goal is to pass the German Bicycle Entry Light Regulations. First, analyze the optical characteristics and cost of a variety of commercially available white light high-power LED, find the LED that meet the characteristics and cost, and pass this regulation with a direct TIR lens.

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The quality of sleep can affect the efficiency, concentration and mood of workers.In order to improve the quality of sleep, this study has previously proposed lamps with low blue light source LEDs and color temperature changes. In order to be closer to life, it is easy to carry and use as a starting point every day, so it is applied to smart mobile devices as a method to enhance sleep quality, and develop a mobile device assistant of Light App according to the needs of the experiment.

 

A high luminance white light source based on blue laser diode pumping single-crystal phosphor is proposed. The photon recycling method is used to minimize the Étendue and increase the luminance effectively. The final design can achieve the luminance value at 1200 cd/mm^2 in the 1.6×1.2 mm^2 emitting area.

 

In order to read text clearly, people often increased the brightness of desk lamp, which rose the incidence rate of photoretinitis. We found that the illuminance required for clear reading increased with diopters and it increased more when font size was reduced. In addition, we also found that under same font size, the illuminance required for reading with white light is higher than that of candlelight.

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The effects of p-type last barrier on deep ultraviolet light emitting diodes (DUV LEDs) were investigated. The hole injection of DUV LEDs was improved by p-type last barrier, and the light output power of DUV LEDs with p-type last barrier was enhanced approximately 42% at injection current of 600 mA.

 

In this study, a white light lamp with adjustable axially symmetric colour non-uniform light pattern, which is composed a blue LED, a TIR lens, a moved double convex lens and a phosphor plate, is proposed. The optical performance of the lamp will be evaluated in below.

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The use of LED array substrates is not limited to the packaging of a single LED. For the light source space, we have a greater degree and use chips in different positions to generate different light types to meet different needs or regulations.

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The performance of DUV LED is optimized by employing a triangular EBL. Simulation results show that wall plug efficiency (WPE) has improved from 1.89% to 2.21% due to reduction of electron overflow. The WPE is further improved to 2.28% by optimizing Al composition of triangular EBL from 70% to 80%.

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This research uses Graphene, which is the most popular in recent years, as a dopant. Graphene is doped into silver paste. With Graphene's high thermal conductivity, we can improve the optical-thermal characteristics and increase the life of the LED.

 

In this study, the replication of rose petal surface structure are patterned onto the top surface of phosphor-converted LEDs (pcLEDs) to reduce the angular variation of correlated color temperature (CCT) of pcLEDs. It is found that the replication of rose petal surface structure on the pcLED can redistribute the blue and yellow light from normal direction to large angle. Thus, the angular color uniformity of pcLEDs with the replication of rose petal surface can be improved.

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The photochemical stability of the curcumin used in the phosphor-converted LEDs (pc-LEDs) is investigated in this study. The host materials of silicone and epoxy are used to encapsulate the curcumin, and then illuminated by a blue emitter LED to access the emission spectra measured at different illuminating times. The long-term photochemical stability of the curcumins film using silicone and epoxy is also conducted to verify the use of the curcumins in pcLEDs.

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An atomic layer deposition (ALD) system was used to deposit SiO2 films with various thicknesses on the red CdSe/ZnS core-shell quantum dots (QDs) as the protective layer. According to the long-time aging testing results, SiO2 protective layer deposited by ALD could effectively prevent QDs being affected by the external environment.

 

Lighting spectra associated with different correlated color temperatures and different circadian stimulus values are designed to evaluate the influence on users’ concentration. The signal processing of acquired brainwaves involves the combination of Hilbert-Huang transform, probability density functions, and receiver operating characteristic curves with their areas under the curves.

 

To achieve high output power and high uniformity using the laser-driven assembled planar light sources, the scattering of light introduced with the SiO2 layer between two adjacent planar glasses are important. In this, study, the SiO2 concentration of the SiO2 layer between two adjacent planar glasses is investigated to contribute the light from the blue laser diodes (LDs) and re-emitting light from remote phosphor layer, and then determine the output luminace and uniformity.

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The Red Pomegranate extract was used in the phosphor-converted LEDs (pcLEDs) to achieve the white light output with low correlated color temperature (CCT). By combining the yellow phosphor and Red Pomegranate extract with the blue LED chip, the white light emission with high output lumens and low CCT can be obtained.

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We demonstrate converting into the illuminance by using the color camera to catch the projection of 2D image, which can be applied to judge if the projection pattern of a headlamp passes the K-mark or ECE R113 class B regulation.

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This research focuses on enhancing the luminous efficiency of white phosphorescent organic light-emitting diodes (PHOLED) by optimizing the parameters of the blue and red light-emitting layers and the dual charge control layer (CCL). Optimized device structure is glass/ITO/MoO3/NPB/mCP/mCP:FIrpic/ mCP/TPBi/TPBi: Ir(piq)2(acac) /TPBi/LiF/Al.

 

A practical algorithm based on commercial specification of a purple light-emitting diode was proposed for seeking the optimal power parameters driven by pulse-width modulation (PWM) suitable for color-tunable application. Our preliminary result indicated that the brightness can be increased over 30% under constant-power mode.

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Ultraviolet mercury lamp has been widely used in food, skin surface sterilization. However, traditional mercury lamps are heavy, short in life, and long in the warm-up period. This paper studies Ultraviolet-C light-emitting diodes (UVC-LED) light panel composed of 64 UVC-LED arrays with a wavelength of 274.5nm and uses high thermal conductivity inorganic material packaging which can increase service life and reduce warm-up time. Analyzes and measures its uniformity and radiant flux. The light emission angle is 140°, the uniformity is 93.14%. It can successfully replace the low-pressure mercury lamp as the next generation of disinfection and sterilization technology.