Principles and Implementation of LED Packaging Technologies for White Light Illumination
Author: S. W. Ricky Lee Company: Hong Kong University of Science and Technology Date Published: 2/11/2014
Pan Pacific Symposium
Abstract: The light-emitting diode (LED) is a semiconductor device that emits photons based on the electroluminescence effect. The light generated by LEDs has a spectrum with relatively narrow band width. Therefore, in principle, LEDs cannot generate white light directly. Although there exist several approaches for white light generation with LEDs, currently most people used blue LED together with yellow phosphor for white light illumination. This paper reviews various LED packaging technologies with phosphor deposition. The features of each approach will be highlighted. Comparisons among different LED packaging and phosphor deposition methods will be discussed.
Light-emitting diode, solid-state lighting, phosphor deposition, color temperature