隨著白光LED照明在整個照明市場中的重要性大幅上升，LED固態照明的一些優點與缺點也隨之被拿來放大檢視，LED最大的優點即為本身有非常高的發光效率，是符合節能減碳的一個新興照明，然而最大的缺點亦是LED本身的特性，由於白光LED目前主流作法為藍色晶片加上黃色YAG螢光粉，因此市面上的白光LED多具有明顯的黃圈現象，而普遍的解決方法為在二次光學設計上加上一層傳統擴散板，但這卻會嚴重降低白光LED的發光效率，因此本論文提出結合一次光學與二次光學的方式，除了在白光LED螢光粉層加入TiO2擴散粒子外，並在二次光學上加上微結構擴散板，以此完美解決黃圈現象，使得最終Angular CCT deviations (ACCTD)只有140K。

With the white LED lighting in the lighting market surged in importance. Some advantages of LED solid-state lighting and disadvantages also will be used to enlarge view. The biggest advantage is the LED itself has a very high luminous efficiency, energy saving and carbon reduction is in line with an emerging lighting. But the biggest drawback is also the characteristics of the LED itself, because of the white LED current mainstream approach to blue chip plus yellow YAG phosphor, so it will make the obvious yellow-ring circle phenomenon of white LED. And universal solution is adding conventional diffuser plate by secondary optics. But it will seriously reduce white LED luminous efficiency, therefore we propose a combination of Primary optics and Secondary optics approach, in addition to add TiO2 particles in white LED phosphor layer diffusion outside, and coupled microstructure diffuser plate in the secondary optics, thus the perfect solution to a yellow circle phenomenon, making the final ACCTD only 140K.

[1] S. Nakamura, and G. Fasol, The Blue Laser Doide: GaN based light emitters and lasers Spinger, Berlin (1997).
[2] 史光國 編著，半導體發光二極體及固體照明，全華科技圖書股份有限公司， 2005
[3] T. Jarvenpaa, “Measuring color brakup of stationary images in field-sequential-color displays,” Journal of the Society for Information Display, Vol.13, Issue 2, pp.134-144, (2005).
[4] 陳宏維，多顆LED晶粒最佳混光之排列，國立台灣科技大學光電工程所碩士學位論文，民國98年7月。
[5] 曾冠綺，高效能多組並聯LED驅動電源研製，國立台灣科技大學電子工程系碩士學位論文，民國98年7月
[6] Y. H. Won, H. S. Jang, K. W. Cho, Y. S Song, D. Y. Jeon, and H. K. Kwon, “Effect of phosphor geometry on the luminous efficiency of high-power white light-emitting diodes with excellent color rendering property”, Optics Letters 34, 1-3 (2009)
[7] 楊臣鑄，光輻射測量原理和方法，計量出版社，北京，1981。
[8] 陳穎慧，基礎光度學與量測實務，量測資訊，P11-16，2005。
[9] 石曉蔚 作，室內照明設計原理，淑馨出版社，P78-84，1996
[10] 光強度量測儀器，http://www.technoteam.de/produkte/nahfeld_
[11] 郭浩中、賴芳儀、郭守義 著，LED原理與應用，五南圖書出版公司，P92-94，2009，12月
[12] L. Pedrotti, S.J. Leno M. Pedrotti Leno S. Pedrotti, Frank “Introduction to Optics third edition” p17-25,( 2007)
[13] 耿繼夜、何建娃 編著，幾何光學，全華圖書股份有限公司，P30-60，2009。
[14] 吳錦銓，LED應用之光學設計-反射罩，國立台灣科技大學電子工程系，綠色電能與LED照明技術議題研討會，2009 。
[15] G. J. Park, T. S. Aum, J. H. Kwon, J. H. Park, B. K. Kim, and J. K. Shin, “Characterization and modeling light scattering in diffuser sheets,” J. Korean Phys. Soc. 54, 44-48 (2009).
[16] Philips Lumileds Lighting Company,
http://www.philipslumileds.com/products/luxeon-C
[17] LightTools from Synopsys,
http://www.opticalres.com/lt/ltprodds_f.html
[18] Intermatix Company, http://www.intematix.com/
[19] Z. Liu, S. Liu, K. Wang, and X. Luo: IEEE Trans. On Device and Mater. Reliab. 9 (2009) 65.
[20] F. W. Mont, J. K. Kim, M. F. Schubert, E. F. Schubert, and R. W. Siegel: J. Appl. Phys. 103 (2008) 083120.
[21] K. Wang, D. Wu, F. Chen, Z. Y. Liu, X. B. Luo, and S. Liu,“Angular color uniformity enhancement of white light-emitting diodes integratedwith freeform lenses,” Opt. Lett., vol. 35, no. 11, pp.1860–1862, Jun.1, 2010
[22] C. C. Sun, C. Y. Chen, C. C. Chen, C. Y. Chiu, Y. N. Peng, Y. H.Wang, T. H. Yang, T. Y. Chung, and C. Y. Chung, “High uniformity inangular correlated-colortemperature distribution of white LEDs from 2800 K to 6500 K,” Opt. Exp., vol. 20, pp. 6622–6630, 2012
[23] D. J. Shertler and N. George,“Uniform scattering patterns from grating diffuser cascades for display applications,” Appl. Opt. 38, 291–303 (1999)
[24] M.M. Ba-Abbad, A. A. Kadhum, A. B. Mohamad, M. S. Takriff, K. Sopian, Int. J. Electrochem. Sci., 7(2012) 4871.