Journal ArticleDOI
Effect of Quantum Dot Scattering and Absorption on the Optical Performance of White Light-Emitting Diodes
TLDR
In this paper, the effect of scattering and absorption of CdSe/ZnS QDs on the optical performance for QCLEDs by comparing with the traditional yttrium aluminum garnet phosphor.Abstract:
Quantum dots (QDs) show a great potential for light-emitting diodes (LEDs) packaging, which still face great challenges compared with the matured phosphor downconversion materials. These are probably caused by the unique scattering and absorption properties of QDs, which are extremely different to the traditional phosphor due to their several nanometers size, while their effect on QDs-converted LEDs (QCLEDs) is barely studied. In this paper, we have experimentally and theoretically investigated the effect of scattering and absorption of CdSe/ZnS QDs on the optical performance for QCLEDs by comparing with the traditional yttrium aluminum garnet phosphor. Results indicate that the strong absorption (reabsorption) of QDs causes low radiant efficacy and stability for QCLEDs; their weak scattering also leads to a low color uniformity. It demonstrates that their unique scattering and absorption properties are key factors leading to low optical performance of QCLEDs compared with the traditional phosphor-converted LEDs. For purpose of gaining the white LED with high efficiency and stability, it is highly suggested to use a low QD concentration to reduce the reabsorption loss and the total internal reflection loss. We believe that this paper can provide a better understanding of improving the optical performance for QCLEDs from the prospective of scattering and absorption. In the future, it is important to use low QD concentration to gain high-performance white LEDs with high downconversion efficiency by optimizing packaging structures.read more
Citations
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(CdSe)ZnS Core−Shell Quantum Dots: Synthesis and Characterization of a Size Series of Highly Luminescent Nanocrystallites
Catherine J. Murphy,Tapan K. Sau,Anand M. Gole,Christopher J. Orendorff,Jinxin Gao,Linfeng Gou,Simona E. Hunyadi,Hannes C. Schniepp,Je-Luen Li,Michael J. McAllister,Hiroaki Sai,Margarita Herrera-Alonso,Douglas H. Adamson,Robert K. Prud'homme,Roberto Car,Dudley A. Saville,Ilhan A. Aksay,Prashant K. Jain,Kyeong Seok Lee,Ivan H. El-Sayed,Yuqing Deng,Matt Law,Lori E. Greene,Aleksandra Radenovic,Tevye Kuykendall,Jan Liphardt +25 more
Journal ArticleDOI
Toward 200 Lumens per Watt of Quantum-Dot White-Light-Emitting Diodes by Reducing Reabsorption Loss.
Jiasheng Li,Yong Tang,Zongtao Li,Jie-Xin Li,Xinrui Ding,Binhai Yu,Yu Shudong,Jian Zhen Ou,Hao-Chung Kuo +8 more
TL;DR: In this article, the influence of the pore structure of an SBA-15 particle on the light emission from its inner adsorbed quantum dots (QDs) and outer light-emitting diode (LED) chips was analyzed.
Journal ArticleDOI
Highly Efficient and Water‐Stable Lead Halide Perovskite Quantum Dots Using Superhydrophobic Aerogel Inorganic Matrix for White Light‐Emitting Diodes
Zongtao Li,Song Cunjiang,Jiasheng Li,Guanwei Liang,Rao Longshi,Yu Shudong,Xinrui Ding,Yong Tang,Binhai Yu,Jian Zhen Ou,Uli Lemmer,Guillaume Gomard +11 more
Journal ArticleDOI
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.
TL;DR: 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 of2D- HPS, decreasing the probability of being captured by QDs inside the hole of 2HPS.
Journal ArticleDOI
Study on the Thermal and Optical Performance of Quantum Dot White Light-Emitting Diodes Using Metal-Based Inverted Packaging Structure
TL;DR: In this article, a metal-based inverted packaging (MIP) structure was proposed to enhance the thermal performance and stability of QD white LEDs by separating the thermal power of the LED chip from the QD layer.
References
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Book
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Journal ArticleDOI
(CdSe)ZnS Core-Shell Quantum Dots - Synthesis and Characterization of a Size Series of Highly Luminescent Nanocrystallites
B. O. Dabbousi,Javier Rodríguez-Viejo,F. V. Mikulec,Jason Heine,Hedi Mattoussi,R. Ober,K. F. Jensen,‡,§ and,Moungi G. Bawendi +7 more
TL;DR: In this paper, a synthesis of highly luminescent (CdSe)ZnS composite quantum dots with CdSe cores ranging in diameter from 23 to 55 A was reported.
Journal ArticleDOI
Emergence of colloidal quantum-dot light-emitting technologies
TL;DR: In this paper, the authors summarized the key advantages of using quantum dots as luminophores in light-emitting devices (LEDs) and outlined the operating mechanisms of four types of QD-LEDs.
Journal ArticleDOI
Synthesis and Properties of Biocompatible Water-Soluble Silica-Coated CdSe/ZnS Semiconductor Quantum Dots†
Daniele Gerion,Fabien Pinaud,Shara C. Williams,Wolfgang J. Parak,Daniela Zanchet,Shimon Weiss,A. Paul Alivisatos +6 more
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