LI Lan, ZHENG Huai, LUO Xiao-bing. 3-Dimensional Lattice Boltzmann Simulation of Phosphor Jel Dispensing Process in Light Emitting Diodes[J]. Applied Mathematics and Mechanics, 2014, 35(3): 264-271. doi: 10.3879/j.issn.1000-0887.2014.03.004
Citation: LI Lan, ZHENG Huai, LUO Xiao-bing. 3-Dimensional Lattice Boltzmann Simulation of Phosphor Jel Dispensing Process in Light Emitting Diodes[J]. Applied Mathematics and Mechanics, 2014, 35(3): 264-271. doi: 10.3879/j.issn.1000-0887.2014.03.004

3-Dimensional Lattice Boltzmann Simulation of Phosphor Jel Dispensing Process in Light Emitting Diodes

doi: 10.3879/j.issn.1000-0887.2014.03.004
Funds:  The National Natural Science Foundation of China(51376070)
  • Received Date: 2013-10-23
  • Rev Recd Date: 2013-12-12
  • Publish Date: 2014-03-15
  • To get white light emission, it’s common to use a blue LED (light emitting diode) chip to be coated with yellow emitting phosphor jel via a dispensing process. The phosphor jel dispensing process is of two-phase flow, which decides the morphology and properties of the phosphor gel, thus strongly influences both optical and thermal performances of the resulting LEDs. It is important to describe the dispensing process accurately and improve the coating quality. Based on the lattice Boltzmann method (LBM), a flow model of phosphor gel was established to simulate the dispensing process. The dispensing and shaping processes of phosphor gel on flat surface and square projection were analyzed respectively. Results show that LBM simulates the dispensing process of phosphor gel accurately and predicts the morphology well. The droplet contact line length changes as a power function of the droplet diameter on flat surface. The simulation results provide a theoretical basis for the optimization of the phosphor gel dispensing process.
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