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

LI Lan; ZHENG Huai; LUO Xiao-bing

doi:10.3879/j.issn.1000-0887.2014.03.004

Volume 35 Issue 3

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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

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

doi: 10.3879/j.issn.1000-0887.2014.03.004

School of Energy and Power Engineering, Huazhong University of Science and Technology,Wuhan 430074, P.R.China

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

Abstract

Abstract

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.
- phosphor dispensing process,
- flowing simulation,
- lattice Boltzmann method

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References(11)

References

[1]	LIU Sheng, LUO Xiao-bing.LED Packaging for Lighting Applications: Design, Manufacturing and Testing [M]. USA: John Wiley & Sons, 2011.
[2]	Zukauskas A, Shur M S, Caska R.Introduction to Solid-State Lighting [M]. New York, USA: John Wiley & Sons, 2002.
[3]	Pimputkar S, Speck J S, DenBaars S P, Nakamura S. Prospects for LED lighting[J].Nature Photonics,2009,3（4）: 180-182.
[4]	HU Run, YU Shan, ZOU Yong, ZHENG Hai, WANG Fei, LIU Sheng, LUO Xiao-bing. Near-/mid-field effect of color mixing for single phosphor-converted light-emitting diode package[J].IEEE Photonics Technology Letters,2013,25(3): 246-249.
[5]	Dupuis A, Yeomans J M. Lattice Boltzmann modeling of droplets on chemically heterogeneous surfaces[J].Future Generation Computer Systems,2004,20（6）: 993-1001.
[6]	Yan Y Y, Zu Y Q. A lattice Boltzmann method for incompressible two-phase flows on partial wetting surface with large density ratio[J].Journal of Computational Physics,2007,227（1）: 763-775.
[7]	Inamuro T, Ogata T, Tajima S, Konishi N. A lattice Boltzmann method for incompressible two-phase flows with large density differences[J].Journal of Computational Physics,2004,198（2）: 628-644.
[8]	Briant A J, Papatzacos P, Yeomans J M. Lattice Boltzmann simulations of contact line motion in a liquid-gas system[J].Philosophical Transactions of the Royal Society of London, Series A,2002,360（1792）: 485-495.
[9]	SHAN Xiao-wen, CHEN Hu-dong. Lattice Boltzmann model for simulating flows with multiple phases and components[J].Physical Review E,1993,47（3）: 1815-1819.
[10]	Shan X, Doolen G. Multi-component lattice-Boltzmann model with interparticle interaction[J].Journal of Statistical Physics,1995,81（1）: 379-393.
[11]	SHEN Sheng-qiang, BI Fei-fei, GUO Ya-li. Simulation of droplets impact on curved surfaces with lattice Boltzmann method[J].International Journal of Heat and Mass Transfer,2012,55(23/24): 6938-6943.