LED Light Extraction Efficiency Improvement and Development of New Solid State Lighting Generated by Visible Laser diode
Date Issued
2015
Date
2015
Author(s)
Liao, Kuan Yung
Abstract
In this thesis, it is separated into two part. In the first part, we have focus on improving light extraction efficiency of LED. The investigation starts at surface patterning of LED chips. By using photolithography and ICP etching, we can fabricate patterned ITO on LED chip. As a result, the output intensity of LEDs with patterned ITO are 2.7% higher compare to reference samples. After the investigation of surface patterning of LED chips, we use ray tracing simulation software to optimize encapsulated lens dimension of LED package. From the simulation results, we construct a formula of encapsulated lens dimension which can provide high light extraction efficiency with controllable radiation pattern. By applying the results from our investigation, a high light extraction efficiency LED can be provided. At the second part, a new high luminance white point light source generated by visible laser diode is developed and provided. The luminance of laser white light achieves 445.8 cd/mm2. Using the high luminance laser white light source, we construct a compact light projecting system designed by ray tracing simulation software. After measurement, the light projecting system shows the center illuminance is 13996lx on the screen 5m far from light source. The estimating 1 iso-lux project distance is 591.5m. In the mean time, an automotive smart lighting concept is illustrated in the end of this thesis.
Subjects
LED
light extraction efficiency
patterned sapphire substrate
surface roughen
laser lighting
light engine design
automotive headlamps design
Type
thesis
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