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Materials 2017, 10(11), 1264; https://doi.org/10.3390/ma10111264

Study on Scattering and Absorption Properties of Quantum-Dot-Converted Elements for Light-Emitting Diodes Using Finite-Difference Time-Domain Method

1
Engineering Research Center of Green Manufacturing for Energy-Saving and New-Energy Technology, South China University of Technology, Guangzhou 510640, China
2
Foshan Nationstar Optoelectronics Company Ltd., Foshan 528000, China
3
Department of Mechanical Engineering, University of California, Berkeley, CA 94720-5800, USA
4
South China Academy of Advanced Optoelectronics, South China Normal University, Guangzhou 510640, China
*
Author to whom correspondence should be addressed.
Received: 31 August 2017 / Revised: 6 October 2017 / Accepted: 30 October 2017 / Published: 3 November 2017
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Abstract

CdSe/ZnS quantum-dot-converted elements (QDCEs) are good candidates for substituting rare-earth phosphor-converted elements (PCEs) in white light-emitting diodes (LEDs); however, studies on their scattering and absorption properties are scarce, suppressing further increment in the optical and thermal performance of quantum-dot-converted LEDs. Therefore, we introduce the finite-difference time-domain (FDTD) method to achieve the critical optical parameters of QDCEs when used in white LEDs; their scattering cross-section (coefficient), absorption cross-section (coefficient), and scattering phase distributions are presented and compared with those of traditional YAG phosphor-converted elements (PCEs) at varying particle size and concentration. At a commonly used concentration ( < 50 mg / cm 3 ), QDCEs exhibit stronger absorption (tens of millimeters, even for green-to-red-wavelength light) and weaker scattering ( < 1 mm 1 ) compared to PCEs; the reabsorption, total internal reflection, angular uniformity, and thermal quenching would be more significant concerns for QDCEs. Therefore, the unique scattering and absorption properties of QDCEs should be considered when used in white LEDs. Furthermore, knowledge of these important optical parameters is helpful for beginning a theoretical study on quantum-dot-converted LEDs according to the ray tracing method. View Full-Text
Keywords: light-emitting diodes; photoluminescence; quantum dots; finite-difference time-domain light-emitting diodes; photoluminescence; quantum dots; finite-difference time-domain
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Li, J.; Tang, Y.; Li, Z.; Ding, X.; Yuan, D.; Yu, B. Study on Scattering and Absorption Properties of Quantum-Dot-Converted Elements for Light-Emitting Diodes Using Finite-Difference Time-Domain Method. Materials 2017, 10, 1264.

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