Novel lighting properties of white LEDs with two-layered remote phosphor package using red-emitting α-SrO•3B2O3:Sm2+ phosphor

• Autorzy: Minh T. H. Q. , Nhan N. H. K. , Anh N. D. Q. , Lee H.-Y.

Identyfikatory

DOI

10.1515/msp-2017-0071

• Języki publikacji: EN

Abstrakty

EN

This paper investigates a method for improving the lighting performance of white light-emitting diodes (WLEDs), packaged using two separating remote phosphor layers, yellow-emitting YAG:Ce phosphor layer and red-emitting α-SrO•3B₂O₃:Sm²⁺ phosphor layer. The thicknesses of these two layers are 800 μm and 200 μm, respectively. Both of them have been examined at average correlated color temperatures (CCT) of 7700 K and 8500 K. For this two-layer model, the concentration of red phosphor has been varied from 2 % to 30 % in the upper layer, while in the lower layer the yellow phosphor concentration was kept at 15 %. It was found interesting that the lighting properties, such as color rendering index (CRI) and luminous flux, are enhanced significantly, while the color uniformity is maintained at a level relatively close to the level in one-layer configuration (measured at the same correlated color temperature). Besides, the transmitted and reflected light of each phosphor layer have been revised by combining Kubelka-Munk and Mie-Lorenz theories. Through the analysis, it is demonstrated that the packaging configuration of two-layered remote phosphor that contains red-emitting α-SrO•3B₂O₃:Sm²⁺ phosphor particles provides a practical solution to general WLEDs lighting.

Słowa kluczowe

EN

remote phosphor structure; two-layered package; luminous flux; color rendering index; light emitting diodes; LEDs

• Wydawca: De Gruyter
• Czasopismo: Materials Science Poland
• Rocznik: 2017
• Tom: Vol. 35, No. 3
• Strony: 618--625
• Opis fizyczny: Bibliogr. 25 poz., rys.

Twórcy

autor

Minh T. H. Q.

• Optoelectronics Research Group, Faculty of Electrical and Electronics Engineering, Ton Duc Thang University, Ho Chi Minh City, Vietnam

autor

Nhan N. H. K.

• Optoelectronics Research Group, Faculty of Electrical and Electronics Engineering, Ton Duc Thang University, Ho Chi Minh City, Vietnam

autor

Anh N. D. Q.

• Faculty of Electrical and Electronics Engineering, Ton Duc Thang University, Ho Chi Minh City, Vietnam

autor

Lee H.-Y.

• Optoelectronics Research Group, Faculty of Electrical and Electronics Engineering, Ton Duc Thang University, Ho Chi Minh City, Vietnam
• Department of Electrical Engineering, National Kaohsiung University of Applied Sciences, Kaohsiung City, Taiwan

Bibliografia

• [1] PIN-CHAO W., YAN-KUIN S., CHUN-LIANG L., GUAN-SYUN H., IEEE Electr. Device L., 6 (2014), 657.
• [2] ARIK M., BECKER C., WEAVER S., PETROSKI J., Proc. SPIE 5187, 64 (2004), 64.
• [3] MUELLER-MACH R., MUELLER G.O., KRAMES M.R., TROTTIER T., IEEE J. Sel. Top. Quant., 2 (2002), 339.
• [4] YOU J.P., TRAN N.T., LIN Y.C., HE Y., SHI F.G., J. Electron. Mater., 6 (2009), 761.
• [5] NARENDRAN N., GU Y., FREYSSINIER-NOVA J.P., ZHU Y., Phys. Status Solidi. A, 6 (2005), R60.
• [6] LUO H., KIM J.K., SCHUBERT E.F., CHO J., SONE C., PARK Y., Appl. Phys. Lett., 24 (2005), 243505.
• [7] KIM J.K., LUO H., SCHUBERT E.F., CHO J., SONE C., PARK Y., Jpn. J. Appl. Phys., 21 (2005), L649.
• [8] SEONG, K.K., YOO T.W., KIM B.-S., LEE S.M., LEE Y.S., PARK L.S., Mol. Cryst. Liq. Cryst., 1 (2012), 33,
• [9] ALLEN S.C., STECKL A.J., J. Disp. Technol., 2 (2007), 155.
• [10] ALLEN S.C., STECKL A.J., J. Appl. Phys., 92 (2008), 143309.
• [11] MASUI H., NAKAMURA S., DENBAARS S.P., Jpn. J. Appl. Phys., 34 (2006), L910.
• [12] QUOC A.N.D., LAI M.F., MA H.Y., LEE H.Y., J. Chin. Inst. Eng., 38 (2015), 1354.
• [13] MUELLER-MACH R., MUELLER G., KRAMES M.R., HOPPE H.A., STADLER F., SCHNICK W., JUESTEL T., SCHMIDT P., Phys. Status Solidi. A, 9 (2005), 1727.
• [14] RUN H., BIN C., YONG Z., YONGMING Z., XIAOBING L., IEEE Photonic. Tech. L., 12, (2013), 156.
• [15] CHUNG H.C., SYUAN J.G., TING S.Z., SHENG Y.C., IEEE Electr. Device L., 7 (2016), 898.
• [16] ZHU Y., NARENDRAN N., Jpn. J. Appl. Phys., 10R (2010), 100203.
• [17] YEN W.M., WEBER M.J., Inorganic Phosphors: Compositions, Preparation and Optical Properties, CRC Press, Washington D.C., 2004.
• [18] MINH Q.H. TRAN, NHAN K.H. NGUYEN, QUOC ANH D.N., J. Chin. Inst. Eng., 4 (2016), 313.
• [19] KUBELKA P., MUNK F., Z. Tech. Phys., 12 (1931), 593.
• [20] MUDGETT P.S., RICHARDS L.W., Appl. Optics, 10 (1971), 1485.
• [21] BRINKWORTH B.J., Appl. Optics, 1 (1972), 1434.
• [22] REISS H., Radiative Transfer in Nontransparent Dispersed Media, Springer, Berlin, 1988.
• [23] ZHONG J., XIE M., OU Z., ZHANG R., HUANG M., ZHAO F., Proceedings Symposium on Photonics and Optoelectronics (SOPO), Wuhan, 2011.
• [24] WYSZECKI G., STILES W.S., Color Science - Concepts and Methods, Quantitative Data and Formulae, Wiley, New York, 1982.
• [25] HUANTING C., HUI S.Y., IEEE T. Ind. Electron., 2 (2014), 784.