| Summary: | 博士 === 國立交通大學 === 光電工程研究所 === 107 === The white light emitting diode has the advantages of high efficiency, power saving, long life and environmental protection, and has received much attention in recent years, especially in the TV backlight and lighting industry. Nowadays, the blue light emitting diode is used to excite the photoluminescent material to form white light. Among the photoluminescent materials, the characteristics of the phosphor are stable, it becomes the major photoluminescent material when the LED is popularized, Since the white light emitting diode technology is fully developed, the Quantum dots has the characteristic of narrow wavelength bandwidth, whose wavelength can be modulated by the particle size. It has gradually become the mainstream of the new generation of forward-looking semiconductor display technology.
On the other hand, it usually includes a set of secondary optical modules when the light emitting diode has been design from component to the module that can be used. Generally, the secondary optics modules include an internal total reflection lens, a free-form lens, and a Fresnel lens. But in response to the forward-looking display technology and the miniaturization trends required by IoT sensors, introducing the concept of secondary optics into the primary optics of components is a key technology currently under discussion.
In this study, our goal is to design a light emitting diode package with secondary optical characteristics and high light extraction efficiency. The first part, we establish a model for the energy transfer theory in the LED package, and use the concept of down-conversion to estimate the energy transfer model of light emitting diode suitable for real verification. This model is also verified both on phosphor and Quantum dots material. After the model is established, in order to improve the light extraction efficiency of the traditional light-emitting diode package, this study will optimize the wafer-level package light-emitting diode. This concept successfully increased the light extraction efficiency of the traditional SMD type package by 9.4%.
Furthermore, this study introduces the algorithm development process of the body light source correction for the free-form surface design method for the purpose of suitable primary optical components that is used in advanced TV backlight application and completes the "Study on freeform-designed chip scale package" with this algorithm. The structure has two advantages: 1. Bat-wing 140 degrees (bat-type light pattern) 2. Ultra-high light extraction efficiency (about 96%). It is suitable for forward-looking display technology in backlight applications like mini-LED.
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