Improving Lighting Performance of High Color Temperature White LED Packages Using (La,Ce,Tb) PO4:Ce:Tb Phosphor

Tóm tắt

Enhancement of the color uniformity, the lumen output of the multi-chip white LED lamps (MCW-LEDs) at high color correlated temperature is a big challenge for researchers. However, an innovative LED lamp designed with a phosphor compounding, which combines (La,Ce,Tb) PO4:Ce:Tb (LaTb) green phosphor with YAG: CE yellow phosphor, is proposed as an optimal solution to this requirement. Index, using LaTb green phosphor into MCWLEDs could bring a superior optical performance for MCW-LEDs. It is found that the lumen output of this new MCW-LED at a high color temperature of 8500 K significantly improves up to 1600 lm compared to MCW-LEDs without LaTb phosphor. The simulation results demonstrated that the CCT deviation sharply decreases from 9000 to 1000 at the LaTb concentration range from 0 to 1.8 %, while the Color Rendering Index ability (CRI) and the Color Quality Scale (CQS) slightly decrease. To obtain the highest lumen output and the best color uniformity, the particle size range within 6 - 8 µm should be suggested.

Từ khoá

Color quality, (La,Ce,Tb)PO4:Ce:Tb, luminous ux, multi-chip white LED lamp.

Tài liệu tham khảo

[1] CHEN, K.-J., C.-C. LIN, H.-V. HAN, C.-
Y. LEE, S.-H. CHIEN, K.-Y. WANG, S.-
H. CHIU, Z.-Y. TU, J.-R. LI, T.-MING
C., X. LI, M.-H. SHIH and H.-C. KUO.
Wide-Range Correlated Color Temperature
Light Generation From Resonant Cavity
Hybrid Quantum Dot Light-Emitting
Diodes. IEEE journal of selected topics in
quantum electronics. 2015, vol. 21, iss. 4,
pp. 649651.
[2] SHEN, C., J. CHU, F. QIAN, X. ZOU,
C. ZHONG, K. LI and S. JIN. High
color rendering index white LED based
on nano-YAG:Ce3+ phosphor hybrid with
CdSe/CdS/ZnS core/shell/shell quantum
dots. Journal of Modern Optics. 2012,
vol. 59, iss. 14, pp. 11991203.
[3] KIM, J. K., H. LUO, E. F. SCHUBERT,
J. CHO, C. SONE and Y. PARK. Strongly
Enhanced Phosphor Eciency in GaInN
White Light-Emitting Diodes Using Remote
Phosphor Conguration and Diuse
Reector Cup. Japanese Journal of Applied
Physics. 2005, vol. 44, iss. 21, pp. 649651.
[4] YING, S.-P. and J.-Y. SHEN. Concentric
ring phosphor geometry on the luminous efciency
of white-light-emitting diodes with
excellent color rendering propert. Optics
Letters. 2016, vol. 41, iss. 9, pp. 19891992.
[5] YU, S., Z. LI, G. LIANG, Y. TANG, B.
YU and K. CHEN. Angular color uniformity
enhancement of white light-emitting
diodes by remote micro-patterned phosphor
lm. Photonics Research. 2016, vol. 4, iss. 4,
pp. 140145.
[6] CHEN, E., R. WU and T. GUO. Design
a freeform microlens array module for any
arbitrary-shape collimated beam shaping
and color mixing. Optics Communications.
2014, vol. 321, iss. 1, pp. 7885.
[7] ANH, N. D. Q., M.-F. LAI, H.-Y. MA and
H.-Y. LEE. Design of a free-form lens for
LED light with high eciency and uniform
illumination. Journal of Display Technology.
2014, vol. 53, iss. 29, pp. 140145.
and V. DUBEY. UV Induced
Thermoluminescence and Photoluminescence
Studies of Sm3+ Doped LaAlO3
Phosphor. Journal of Display Technology.
2016, vol. 12, iss. 9, pp. 928932.
[9] WON, Y. H., H. S. JANG, K. W. CHO, Y.
S. SONG, D. Y. JEON and H. K. KWON.
Eect of phosphor geometry on the luminous
eciency of high-power white lightemitting
diodes with excellent color rendering
property. Journal of Display Technology.
2009, vol. 34, iss. 1, pp. 13.
[10] SHI, Y., Y. WANG, D. WANG, B. LIU,
Y. LI and L. WEI. Synthesis of Hexagonal
Prism (La, Ce, Tb)PO4 Phosphors by
Precipitation Method. Crystal Growth and
Design. 2012, vol. 12, iss. 4, pp. 17851791.
[11] LIU, S. and X. B. LUO. LED Packaging
for Lighting Applications: Design,
Manufacturing and Testing. 1st ed. Singapore:
Chemistry Industry Press and John
Wiley and Sons, 2011. ISBN 978-0-470-
[12] LIU, Z. Y., C. LI, B.-H. YU, Y.-H. WANG
and H.-B. NIU. Eects of YAG: Ce Phosphor
Particle Size on Luminous Flux and
Angular Color Uniformity of PhosphorConverted
White LEDs. Journal of Display
Technology. 2012, vol. 8, iss. 6, pp. 329335.
[13] LI, J., Z. LI, G. LIANG, S. YU, Y. TANG
and X. DING. Color uniformity enhancement
for COB WLEDs using a remote phosphor
lm with two freeform surfaces. Optic
Express. 2016, vol. 24, no. 21, pp. 23685

Các bài trích dẫn đến

1. Doan Quoc Anh Nguyen, Thi Phuong Thao Nguyen, Postava Kamil. Enhancing Luminous Efficacy of White Led Lamp Using Ca2MgSi2O7: Eu2+ Phosphor in Journal of Advanced Engineering and Computation (Vol. 2, No. 2, 2018)
2. Doan Quoc Anh Nguyen. The Impacts of Red-Emitting SrwFxByOz: Eu2+, Sm2+ Phosphor on Color Quality of Dual-Layer Phosphor Geometry in Journal of Advanced Engineering and Computation (Vol. 2, No. 3, 2018)