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ACS Appl Mater Interfaces. 2019 May 22;11(20):18808-18816. doi: 10.1021/acsami.8b22298. Epub 2019 Apr 26.

Largely Enhancing Luminous Efficacy, Color-Conversion Efficiency, and Stability for Quantum-Dot White LEDs Using the Two-Dimensional Hexagonal Pore Structure of SBA-15 Mesoporous Particles.

Li J1,2, Tang Y1, Li Z1,2, Ding X1, Yu B1, Lin L3.

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Engineering Research Center of Green Manufacturing for Energy-Saving and New-Energy Technology , South China University of Technology , Guangdong 510640 , China.
Foshan Nationstar Optoelectronics Company Ltd. , Foshan 528000 , China.
Department of Mechanical Engineering , University of California , Berkeley , California 94720-5800 , United States.


Quantum-dot (QD) white light-emitting diodes (LEDs) are promising for illumination and display applications due to their excellent color quality. Although they have a high quantum yield close to unity, the reabsorption of QD light leads to high conversion loss, significantly reducing the luminous efficacy and stability of QD white LEDs. In this report, SBA-15 mesoporous particles (MPs) with two-dimensional hexagonal pore structures (2D-HPS) are utilized to largely enhance the luminous efficacy and color-conversion efficiency of QD white LEDs in excess of 50%. The reduction in conversion loss also helps QD white LEDs to achieve a lifetime 1.9 times longer than that of LEDs using QD-only composites at harsh aging conditions. Simulation and testing results suggest that the waveguide effect of 2D-HPS helps in reducing the reabsorption loss by constraining the QD light inside the wall of 2D-HPS, decreasing the probability of being captured by QDs inside the hole of 2D-HPS. As such, materials and mechanisms like SBA-15 MPs with 2D-HPS could provide a new path to improve the photon management of QD light, comprehensively enhancing the performances of QD white LEDs.


SBA-15 mesoporous particle; luminous efficacy; quantum-dot white light-emitting diode; reabsorption; stability; two-dimensional hexagonal pore structure


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