Fabrication of White Light-Emitting Diodes Based on UV Light-Emitting Diodes with Conjugated Polymers-(CdSe/ZnS) Quantum Dots as Hybrid Phosphors
- Authors
- Jung, Hyunchul; Chung, Wonkeun; Lee, Chang Hun; Kim, Sung Hyun
- Issue Date
- 7월-2012
- Publisher
- AMER SCIENTIFIC PUBLISHERS
- Keywords
- White Light-Emitting Diode; CdSe/ZnS Quantum Dot; Conjugated Polymer
- Citation
- JOURNAL OF NANOSCIENCE AND NANOTECHNOLOGY, v.12, no.7, pp.5407 - 5411
- Indexed
- SCIE
SCOPUS
- Journal Title
- JOURNAL OF NANOSCIENCE AND NANOTECHNOLOGY
- Volume
- 12
- Number
- 7
- Start Page
- 5407
- End Page
- 5411
- URI
- https://scholar.korea.ac.kr/handle/2021.sw.korea/108033
- DOI
- 10.1166/jnn.2012.6288
- ISSN
- 1533-4880
- Abstract
- White light-emitting diodes (LEDs) were fabricated using GaN-based 380-nm UV LEDs precoated with the composite of blue-emitting polymer (poly[(9,9-dihexylfluorenyl-2,7-diyl)-alt-co-(2-methoxy-5-{2-ethylhexyloxy}-1,4-phenylene)]), yellow green-emitting polymer (poly[(9,9-dioctylfluorenyl-2,7-diyl)-co-(1,4-benzo-{2,1',3}-thiadiazole)]), and 605-nm red-emitting quantum dots (QDs). CdSe cores were obtained by solvothermal route using CdO, Se precursors and ZnS shells were synthesized by using diethylzinc, and hexamethyldisilathiane precursors. The optical properties of CdSe/ZnS QDs were characterized by UV-visible and photoluminescence (PL) spectra. The structural data and composition of the QDs were transmission electron microscopy (TEM), and EDX technique. The quantum yield and size of the Q Ds were 58.7% and about 6.7 nm, respectively. Three-band white light was generated by hybridizing blue (430 nm), green (535 nm), and red (605 nm) emission. The color-rendering index (CAI) of the device was extremely improved by introducing the QDs. The CIE-1931 chromaticity coordinate, color temperature, and CRI of a white LED at 20 mA were (0.379, 0.368), 3969 K, and 90, respectively.
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Collections - College of Engineering > Department of Chemical and Biological Engineering > 1. Journal Articles
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