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ISSN Online: 2377-424X

ISBN Print: 978-1-56700-421-2

International Heat Transfer Conference 15
August, 10-15, 2014, Kyoto, Japan

Three-Dimensional Simulation of Phosphor Dispensing Process in Light Emitting Diode Packaging by Lattice Boltzmann Method

Get access (open in a dialog) DOI: 10.1615/IHTC15.mfp.008383
pages 4709-4719

摘要

To get white light emission, it’s common to use a blue light emitting diode (LED) chip covered with yellow emitting phosphor via a dispensing process. The phosphor coating is a process of two-phase flow, which decides the morphology and the properties of the phosphor gel, thus strongly influences both optical and thermal performances of LEDs. It is important to describe the dispensing process accurately to improve dispensing quality. Based on the lattice Boltzmann method (LBM), a flow model of phosphor gel was established to simulate the dispensing process. The dispensing and forming process of phosphor gel were analyzed on flat surface and square projection respectively. Experimental results show that LBM can simulate the dispensing process accurately and predict the morphology. The droplet contact line changes as a power function as (dl / D) ~ (t / T) m on flat surface.