Session Index

We report the fabrication of white LED lamps by coating red phosphor onto the green/blue dual-color tunnel-junction LED chips. It was found that TC observed from the dual-color TJ LED+red phosphor white LED lamps were smaller than those observed from the blue LED+yellow phosphor white LED lamps.

 

The thermal characteristics of LED bulbs are improved by a heat sink arranged aligning to the positions of LEDs. The maximum temperature of the LED surface is 80℃ and is lowered by 40℃ compared with that of the LED with a heat sink arranged misaligning to
the LED positions.

 

Using Kelvin probe force microscopy to study localized Ga distribution in AlGaN/AlGaN multiple quantum wells with different NH3 nitridation procedures, experimental results showed that the KPFM image and the corresponding potential standard deviation were regarded as an indicator of localized Ga distribution, which was positive correlation to the electroluminescence intensity.

 

In this report, we successfully used a homemade atmospheric plasma jet to prepare zinc oxide thin films on commercially available (0001) p-GaN substrates, verified that it can form QD/n-ZnO/p-GaN light-emitting diode, and discussed its light-emitting diode characteristics.

 

In this study of LED lighting module, LED is directly soldered on a reflector made of a hemispherical alumina substrate to facilitate heat dissipation and provide specific light distribution. Two prototypes are investigated: LEDs are both attached inside the inner surface of a semi-spherical reflector.

 

This study investigates the optical design of planar curved LED3D bar using microlens structures as light diverting structures.The LED 3D lighting is a popular application in automotive.We have developed diffuser plates with properties which are specially optimized for this type of backlight system and have released them onto the market

 

Our results show reading safety to increase with the decrease of the desk lamp brightness.
Color temperature shows no effect on reading clarity within 1800 to 6000 K, but reading safety is
increased as the color temperature is lower.

 

Light management is potentially a non-pharmacological method to improve the sleep cycle and quality of life of persons living with dementia. We propose lighting based on LED strips in which intensity and spectrum are dynamically controlled and that is suitable for deployment in a long term facility or family dwelling.

 

A new design of laser system for automotive headlight, providing road illumination and infrared function for night vision. Laser beam was guide to the reflective phosphor and converted to high intensity light. Under ECE standard, the efficiency was reached up to 60% and 550 meters distance better than traditional headlight

 

The illuminance area at sea level above 900 lx under different tilt angles of the pole with LED fishing lamps is calculated using Dialux, and the maximum illuminance area is 3597 m2 at title angle of 30 degrees. Further the illuminance at different sea depths is also calculated.

 

Using the high-power LED lamp with the combined lens, the design of the liquid crystal alignment box is adopted to achieve the cut-off line of the far and near light defined by the regulations.

 

This paper investigated the effect of light extraction on the junction temperature and reliability for InGaN light emitting diodes. Difference of light extraction was caused by varied transparency of transparent contacts. Results showed that 16% larger in light extraction caused 7 oC lower in junction temperature and better reliability.

 

We investigated the stability issues of the lighting system consists of multiple organic light-emitting diodes (OLED’s) by theoretically analyzing the system transfer functions in which system-wise parameters can be obtained as these OLED’s undergo direct-current and independent matrix driving schemes with or without feedback signals.

 

The new design of Anti-Glared LED luminaire that using the WFB and the optical films to enhance the reflectivity of light output can meet the requirement of UL 8750 safety standard. The experimental result showed that higher of light intensity was found comparing with the commercial design.

 

To realize the laser-based white light technology, it consisted of a blue laser diode and a phosphor rod is proposed. The phosphor rods is used to direct the blue laser light to phosphor particles and reduce the high density laser irradiation on phosphor layer, and they could be easily applied.

 

This study used a wide-area UV LED (395nm UV LED) to induce a mosquito system, and a black appearance to enhance the effect, combined with intelligent solar control power management device and dim street lighting system to improve the lack of mosquito repellent equipment in the region.

 

The new design of integrated LED luminaire allowed the LED product to meet enclosure requirements specified in UL 8750 safety standard for LED equipment without using a glass plate, a flame-retardant plastic lens or a based material. The white flame barrier’s high reflectivity helped improve light output.

 

In this study, the cylinder lenses with different radius are used to design of the LED headlamp and to meet the regulation requirement of ECE R112. It is found that the multiple LED devices using cylinder lenses could provide a clear cut-off line on the light pattern.