Abstract

Effects of YAG: Ce phosphor particle size on the luminous flux and angular color uniformity have been studied by using Monte Carlo ray-tracing simulation. A white LED model basing on Cree XLamp is constructed. The phosphor particle size is changed from 2 to 20 $\mu$m. Different simulation cases are carried out by changing the phosphor concentration and thickness. Results revealed that the luminous flux and angular color uniformity have complex relationships with the particle size depending on applied phosphor concentration and desired color temperature. A general finding is that an increase of the particle size is beneficial for the improvement of luminous flux but leads to worse angular color uniformity. A 2 μm particle achieves not only the best angular color uniformity but the lowest luminous flux. A particle size larger than 10 μm generates the highest luminous flux at low color temperature when the concentration is around 1.5 g/cm<sup>3</sup>. A particle size between 2 μm and 10 μm shows combined moderate performance when the phosphor concentration is higher than 2 g/cm<sup>3</sup>. To realize the best combined performance, a particle size around 6 μm is suggested.

© 2012 IEEE

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2011 (1)

Y. Shuai, N. T. Tan, F. G. Shi, "Nonmonotonic phosphor size dependence of luminous efficacy for typical white LED emitters," IEEE Photon. Technol. Lett. 23, 552-554 (2011).

2010 (5)

Z. Y. Liu, K. Wang, X. B. Luo, S. Liu, "Precise optical modeling of blue light-emitting diodes by Monte Carlo ray-tracing," Opt. Express 18, 9398-9412 (2010).

H.-T. Huang, C.-C. Tsai, Y.-P. Huang, "Conformal phosphor coating using pulsed spray to reduce color deviation of white LEDs," Opt. Express 18, A201-A206 (2010).

Z. Y. Liu, S. Liu, K. Wang, X. B. Luo, "Studies on optical consistency of white LEDs affected by phosphor thickness and concentration using optical simulation," IEEE Trans. Compon. Packag. Technol. 33, 680-687 (2010).

Z. Y. Liu, S. Liu, K. Wang, X. B. Luo, "Measurement and numerical studies of optical properties of YAG:Ce phosphor for white light-emitting diode packaging," Appl. Opt. 49, 247-257 (2010).

R. Y. Yu, S. Z. Jin, S. Y. Cen, P. Liang, "Effect of the phosphor geometry on the luminous flux of phosphor converted light-emitting diodes," IEEE Photon. Technol. Lett. 22, 1765-1767 (2010).

2009 (5)

B. Hou, H. Rao, J. Li, "Methods of increasing luminous efficiency of phosphor-converted LED realized by conformal phosphor coating," J. Display Technol. 5, 57-60 (2009).

Z. Y. Liu, S. Liu, K. Wang, X. B. Luo, "Optical analysis of phosphor's location for high-power light-emitting diodes," IEEE Trans. Devices Mater. Rel. 9, 65-73 (2009).

Z. Liu, S. Liu, K. Wang, X. Luo, "Status and prospect for phosphor-based white light-emitting diodes packaging," Frontiers of Optoelectron. in China 2, 119-140 (2009).

N. T. Tan, J. P. You, F. G. Shi, "Effect of phosphor particle size on luminous efficacy of phosphor-converted white LED," J. Lightw. Technol. 27, 5145-5150 (2009).

C. Sommer, J. R. Krenn, P. Hartmann, P. Pachler, M. Schweighart, S. Tasch, F. P. Wenzl, "The effect of the phosphor particle sizes on the angular homogeneity of phosphor-converted high-power white LED light sources," IEEE J. Sel. Top. Quantum Electron. 15, 1181-1188 (2009).

2008 (4)

N. T. Tran, F. G. Shi, "Studies of phosphor concentration and thickness for phosphor-based white light-emitting-diodes," J. Lightw. Technol. 26, 3556-3559 (2008).

C. Sommer, F. P. Wenzl, P. Hartmann, P. Pachler, M. Schweighart, G. Leising, "Tailoring of the color conversion elements in phosphor-converted high-power LEDs by optical simulations," IEEE Photon. Technol. Lett. 20, 739-741 (2008).

S. C. Allen, A. J. Steckl, "A nearly ideal phosphor-converted white light-emitting diode," Appl. Phys. Lett. 92, 143309 (2008).

Z. Y. Liu, S. Liu, K. Wang, X. B. Luo, "Optical analysis of color distribution in white LEDs with various packaging methods," IEEE Photon. Technol. Lett. 20, 2027-2029 (2008).

2007 (2)

2005 (1)

H. Luo, J. K. Kim, E. F. Schubert, J. Cho, C. Sone, Y. Park, "Analysis of high-power packages for phosphor-based white-light-emitting diodes," Appl. Phys. Lett. 86, 243505 (2005).

Appl. Opt. (1)

Appl. Phys. Lett. (2)

H. Luo, J. K. Kim, E. F. Schubert, J. Cho, C. Sone, Y. Park, "Analysis of high-power packages for phosphor-based white-light-emitting diodes," Appl. Phys. Lett. 86, 243505 (2005).

S. C. Allen, A. J. Steckl, "A nearly ideal phosphor-converted white light-emitting diode," Appl. Phys. Lett. 92, 143309 (2008).

Frontiers of Optoelectron. in China (1)

Z. Liu, S. Liu, K. Wang, X. Luo, "Status and prospect for phosphor-based white light-emitting diodes packaging," Frontiers of Optoelectron. in China 2, 119-140 (2009).

IEEE J. Sel. Top. Quantum Electron. (1)

C. Sommer, J. R. Krenn, P. Hartmann, P. Pachler, M. Schweighart, S. Tasch, F. P. Wenzl, "The effect of the phosphor particle sizes on the angular homogeneity of phosphor-converted high-power white LED light sources," IEEE J. Sel. Top. Quantum Electron. 15, 1181-1188 (2009).

IEEE Photon. Technol. Lett. (4)

Y. Shuai, N. T. Tan, F. G. Shi, "Nonmonotonic phosphor size dependence of luminous efficacy for typical white LED emitters," IEEE Photon. Technol. Lett. 23, 552-554 (2011).

R. Y. Yu, S. Z. Jin, S. Y. Cen, P. Liang, "Effect of the phosphor geometry on the luminous flux of phosphor converted light-emitting diodes," IEEE Photon. Technol. Lett. 22, 1765-1767 (2010).

Z. Y. Liu, S. Liu, K. Wang, X. B. Luo, "Optical analysis of color distribution in white LEDs with various packaging methods," IEEE Photon. Technol. Lett. 20, 2027-2029 (2008).

C. Sommer, F. P. Wenzl, P. Hartmann, P. Pachler, M. Schweighart, G. Leising, "Tailoring of the color conversion elements in phosphor-converted high-power LEDs by optical simulations," IEEE Photon. Technol. Lett. 20, 739-741 (2008).

IEEE Trans. Compon. Packag. Technol. (1)

Z. Y. Liu, S. Liu, K. Wang, X. B. Luo, "Studies on optical consistency of white LEDs affected by phosphor thickness and concentration using optical simulation," IEEE Trans. Compon. Packag. Technol. 33, 680-687 (2010).

IEEE Trans. Devices Mater. Rel. (1)

Z. Y. Liu, S. Liu, K. Wang, X. B. Luo, "Optical analysis of phosphor's location for high-power light-emitting diodes," IEEE Trans. Devices Mater. Rel. 9, 65-73 (2009).

J. Display Technol. (3)

J. Lightw. Technol. (2)

N. T. Tan, J. P. You, F. G. Shi, "Effect of phosphor particle size on luminous efficacy of phosphor-converted white LED," J. Lightw. Technol. 27, 5145-5150 (2009).

N. T. Tran, F. G. Shi, "Studies of phosphor concentration and thickness for phosphor-based white light-emitting-diodes," J. Lightw. Technol. 26, 3556-3559 (2008).

Opt. Express (2)

Other (3)

Z. Y. Liu, C. Li, B. H. Yu, Y. H. Wang, S. Liu, H. B. Niu, "Effects of YAG: Ce phosphor particle size on optical performance of white LEDs," 2011 Int. Conf. on Electron. Packag. Technol. High Density Packag. (2011) pp. 1-6.

B. Braune, K. Petersen, J. Strauss, P. Kromotis, M. Kaempf, "A new wafer level coating technique to reduce the color distribution of LEDs," Light-Emitting Diodes: Research, Manufacturing, and Applications XI (2007) pp. 64860X-1-64860X-11.

H. Bechtel, P. Schmidt, W. Busselt, B. S. Schreinemacher, "Lumiramic: A new phosphor technology for high performance solid state light sources," 8th Int. Conf. on Solid State Lighting (2008) pp. 70580E-1-70580E-10.

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