Triple-layer remote phosphor structure: A potential packaging configuration to enhance both color quality and lumen efficiency of 6,000–8,500 K WLEDs

• Autorzy: Le Phan Xuan , Ho Sang Dang , Anh Nguyen Doan Quoc , Lee Hsiao-Yi

Identyfikatory

DOI

10.2478/msp-2021-0037

• Języki publikacji: EN

Abstrakty

EN

To achieve further enhancement in the lighting quality of white light-emitting diodes (WLEDs), this study proposed apackaging structure with three different phosphor layers, called triple-layer remote phosphor structure. This structure can provide an overall control over the light color distribution of WLEDs. The yellow-green-emitting CaAl₂O₄:Mn²⁺ phosphor andredemitting CaMoO₄:Eu³⁺ phosphor are used along with the original yellow-emitting YAG:Ce³⁺phosphor to fabricate thetriple-layer structure. The concentration of yellow-emitting YAG:Ce³⁺phosphor is required to be decreased as the concentrations of other phosphors increase to keep the predetermined correlated color temperatures. The color rendering index (CRI) and the color quality scale (CQS) are measured to reach a thorough color quality assessment for WLEDs. The color management can be achieved by adjusting the concentration of red-emitting CaMoO₄:Eu³⁺ phosphor to enhance the red emission. In addition, adjustment of the concentration of yellow-green-emitting CaAl₂O₄:Mn²⁺ phosphor can result in higher luminousefficiency owing to its control over the green light components. Higher CRI is observed when CaMoO₄:Eu³⁺ concentration increases, while an increase in CaAl₂O₄:Mn²⁺ phosphor leads to much lower CRI. The CQS – on the other hand – is remarkably high when the CaMoO₄:Eu³⁺ concentration range is about 10wt%–14wt%, regardless of the proportion of the CaAl₂O₄:Mn²⁺ phosphor. Furthermore, 40% enhancement in luminous efficiency is also achieved since light scattering is minimized by the boosted green-light emission spectra. Manufacturers can take these findings as reference to fabricate high-quality WLED lights that fulfill all their requirements.

Słowa kluczowe

EN

WLEDs; CaMoO4:Eu3+; CaAl2O4:Mn2+; luminous efficiency; color quality; remote phosphor structure; triple-layer phosphor structure

• Wydawca: De Gruyter
• Czasopismo: Materials Science Poland
• Rocznik: 2021
• Tom: Vol. 39, No. 4
• Strony: 458--466
• Opis fizyczny: Bibliogr. 26 poz., rys., tab.

Twórcy

autor

Le Phan Xuan

• Faculty of Engineering, Van Lang University, 69/68 Dang Thuy Tram Street, Ward 13, Binh Thanh District, Ho Chi Minh City, Vietnam

autor

Ho Sang Dang

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

autor

Anh Nguyen Doan Quoc

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

autor

Lee Hsiao-Yi

• Department of Electrical Engineering, National Kaohsiung University of Science and Technology, Kaohsiung, Taiwan

Bibliografia

• [1] Luo G-F, Loan NTP, Tho LV, Anh NDQ, Lee H-Y. Enhancement of color quality and luminous flux for remote-phosphor LEDs with red-emitting CaMgSi2O6:Eu2+, Mn2+. Mater Sci Pol. 2020;38:409– 15, doi:10.2478/msp-2020-0045.
• [2] Anh NDQ, Ngoc HV. Building superior lighting properties for WLEDs utilizing two-layered remote phosphor configurations. Mater Sci Pol. 2020;38:493–501, doi:10.2478/msp-2020-0044.
• [3] Anh NDQ, Vinh NH, Lee H-Y. Effect of redemitting Sr2.41F2.59B20.03O74.8:Eu0.12, Sm0.048 phosphor on color rendering index and luminous efficacy of white LEDs. Curr Opt Photon. 2017;1:118–24, doi:10.3807/COPP.2017.1.2.118.
• [4] Anh NDQ, Vinh NH, Lee H-Y, Lee H-Y. Gaussian decomposition method in designing a freeform lens for an LED fishing/working lamp. Curr Opt Photon. 2017;1:233–8, doi:10.3807/COPP.2017.1.3.233.
• [5] Sun W-S, Tien C-L, Pan J-W, Yang T-H, Tsuei C-H, Huang Y-H. Simulation and comparison of the lighting efficiency for household illumination with LEDs and fluorescent lamps. J Opt Soc Korea. 2013;17:376–83, doi:10.3807/JOSK.2013.17.5.376.
• [6] Hayashida T, Iwasaki H, Masaoka K, Shimizu M, Yamashita T, Iwai W. Appropriate indices for color rendition and their recommended values for UHDTV production using white LED lighting. Opt Express. 2017;25:15010–27, doi: 10.1364/OE.25.015010.
• [7] Jiang P-Q, Peng Y, Mou Y, Cheng H, Chen MX, Liu S. Thermally stable multi-color phosphor-inglass bonded on flip-chip UV-LEDs for chromaticitytunable WLEDs. Appl Opt. 2017;56:7921–6, doi: 10.1364/AO.56.007921.
• [8] Yang Z-F, Xu D-H, Sun J-Y. Synthesis and luminescence properties of Ba3Lu(PO4)3:Sm3+ phosphor for white light-emitting diodes. Opt Express. 2017;25:A391–401, doi:10.1364/OE.25.00A391.
• [9] Lyapin AA, Gushchin SV, Ermakov AS, Kuznetsov SV, Ryabochkina PA, Yu V, et al.. Mechanisms and absolute quantum yield of upconversion luminescence of fluoride phosphors. Chin Opt Lett. 2018;16:091901, doi:10.3788/COL201816.091901.
• [10] Jeon S-W, Kim S-H, Choi J, Jang I, Song Y-H, Kim WH, et al. Optical design of dental light using a remote phosphor light-emitting diode package for improving illumination uniformity. Appl Opt. 2018;57:5998–6003, doi: 10.1364/AO.57.005998.
• [11] Lee H-S, Kim S-H, Heo J, Chung WJ. Phosphorin-glass with Nd-doped glass for a white LED with a wide color gamut. Opt Lett. 2018;43:627–30, doi:10.1364/OL.43.000627.
• [12] Ojo AO, Fond B, Abram C, Wachem BGMV, Heyes AL, Beyrau F. Thermographic laser Doppler velocimetry using the phase-shifted luminescence of BAM:Eu2+ phosphor particles for thermometry. Opt Express. 2017;25:11833–43, doi:10.1364/OE.25.011833.
• [13] Liu K-K, Shan C-X, Zhou R, Zhao Q, Shen D-Z. Largescale synthesis of ZnO nanoparticles and their application as phosphors in light-emitting devices. Opt Mater Express. 2017;7:2682–90, doi:10.1364/OME.7.002682.
• [14] Tang L, Ye HQ, Xiao D. Photo-induced luminescence degradation in Ce, Yb co-doped yttrium aluminum garnet phosphors. Appl Opt. 2018;57:7627–33, doi: 10.1364/AO.57.007627.
• [15] Huang Z, Nie ZQ, Xie MB, Wang YX, Li DY. Excellent optical thermometry based on upconversion emission in SrMoO4:Er3+ phosphor. Opt Mater Express. 2017;7:2404–10, doi:10.1364/OME.7.002404.
• [16] Qi YH, Zhao L, Bian WJ, Yu X, Xu XH, Qiu JB. Energy transfer between Ce3+ and Sm3+ in Zn2GeO4 phosphor with the native defects for lightemitting diodes. Chin Opt Lett. 2017;15:081601, doi:10.3788/COL201715.081601.
• [17] Chen GB, Zhang J. Investigation on optical temperature sensing behaviour for Y4.67Si3O13:Tm3+, Yb3+ phosphors based on upconversion luminescence. Opt Mater Express. 2018;8:1841–9, doi:10.1364/OME.8.001841.
• [18] Yen WM, Weber MJ. Inorganic phosphors: compositions, preparation and optical properties. Boca Raton, FL: CRC Press; 2004, doi:10.1201/9780203506325.
• [19] Liu S, Luo XB. LED packaging for lighting applications: design, manufacturing and testing, Chapter 3. Beijing: Chemical Industry Press and John Wiley & Sons; 2011, doi:10.1002/9780470827857.
• [20] Shuai Y, Tran NT, You JP, Shi FG. Phosphor size dependence of lumen efficiency and spatial CCT uniformity for typical white LED emitters. IEEE ECTC, 2025 – 2028; 2012, doi: 10.1109/ECTC.2012.6249118.
• [21] Davis W, Ohno Y. Color quality scale. Opt Eng. 2010;49:033602–033602–16, doi:10.1117/1.3360335.
• [22] Li B-C, Zhang D-W, Huang Y-S, Ni ZJ, Zhuang S-L. A new structure of multi-layer phosphor package of white LED with high efficiency. Chin Opt Lett. 2010;8:221–3, doi:10.3788/COL20100802.0221.
• [23] Liu Z-Y, Liu S, Wang K, Luo X-B. Measurement and numerical studies of optical properties of YAG:Ce phosphor for white light-emitting diode packaging. Appl Opt. 2010;49:247–57, doi:10.1364/AO.49.000247.
• [24] Nguyen TMH, Ton TP, Anh NDQ. Eu-activated strontium-barium silicate: a positive solution for improving luminous efficacy and color uniformity of white light-emitting diodes. Mater Sci Pol. 2021;38:594–600, doi:10.2478/msp-2020-0069.
• [25] Ton TP, Phuong LNT, Le VT, Anh NDQ, Yuan LH, Luo G-F, et al. Enhancing color quality of WLEDs with dual-layer remote phosphor geometry. Mater Sci Pol. 2021;38:667–74, doi:10.2478/msp-2020-0070.
• [26] Liu R, Liu L-J, Liang Y-J. Energy transfer and colortunable luminescence properties of YVO4:RE (RE =Eu3+, Sm3+, Dy3+, Tm3+) phosphors via molten salt synthesis. Opt Mater Express. 2018;8:1686–94, doi:10.1364/OME.8.001686.