標題: Highly Stable and Efficient Hybrid Quantum Dot Light-Emitting Diodes
作者: Hsu, Shun-Chieh
Chen, Yin-Han
Tu, Zong-Yi
Han, Hau-Vei
Lin, Shih-Li
Chen, Teng-Ming
Kuo, Hao-Chung
Lin, Chien-Chung
光電系統研究所
照明與能源光電研究所
應用化學系
光電工程學系
Institute of Photonic System
Institute of Lighting and Energy Photonics
Department of Applied Chemistry
Department of Photonics
關鍵字: Light-emitting diodes;quantum dots and colloidal systems;semiconductor materials;sources of solid-state lighting
公開日期: 1-Oct-2015
摘要: A highly efficient and reliable hybrid quantum dot (QD) light-emitting diode (LED) is demonstrated and analyzed. The CdTe colloidal QDs are embedded in the sodium chloride (NaCI) ionic crystal to prevent external wear. The GaN-based ultraviolet (UV) LED is used as the excitation source. The mixture of colloidal QD/NaCI composite and polymer can be filled inside the standard LED package and optically pumped by the UV LED. Two different filling layer designs are fabricated simultaneously for comparative study. Due to extra scattering brought by the sodium chloride grains, the resultant photon conversion efficiency (POE) can be as high as 72.6% at the medium current level. For the long-term stability assessment, two different UV pumping intensities were set up: One is equivalent to 111 mW/cm(2), and the other is 906 mW/cm(2). With this encapsulation, the stability of the colloidal QD light output over time can be improved, and a prolonged lifetime of 6488 h can be demonstrated under the continuous UV aging condition.
URI: http://hdl.handle.net/11536/129421
ISSN: 1943-0655
期刊: IEEE PHOTONICS JOURNAL
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