Enhancing the Color Rendering Index for Phosphor-converted White LEDs Using Cadmium-Free CuInS2/ZnS QDs
- Authors
- Chuang, Po-Hsiang; Lin, Chun Che; Yang, Heesun; Liu, Ru-Shi
- Issue Date
- Jul-2013
- Publisher
- WILEY-V C H VERLAG GMBH
- Keywords
- CuInS2 (CIS) I-III-VI; Quantum dots; White light-emitting diodes; Color rendering index
- Citation
- JOURNAL OF THE CHINESE CHEMICAL SOCIETY, v.60, no.7, pp.801 - 806
- Journal Title
- JOURNAL OF THE CHINESE CHEMICAL SOCIETY
- Volume
- 60
- Number
- 7
- Start Page
- 801
- End Page
- 806
- URI
- https://scholarworks.bwise.kr/hongik/handle/2020.sw.hongik/17104
- DOI
- 10.1002/jccs.201200556
- ISSN
- 0009-4536
- Abstract
- CuInS2 (CIS) I-III-VI-type quantum dots (QDs) were synthesized under different growth times by the facile solvothermal method. Emission wavelengths showed a deep red region (630 - 650 nm) with low quantum yields (QYs). The core CIS was effectively passivated by the coating layer of ZnS, thereby remarkably increasing the QYs (48% and 82%) and causing the blue shift of the emission band (580 - 623 nm). Red-emitting CIS/ZnS QDs that were blended with Y3Al5O12:Ce3+ phosphor-based white light-emitting diodes (LEDs) were further demonstrated. The color rendering index of white LEDs was improved (Ra = 86) by using red-emitting CIS/ZnS QDs with broader spectra. The optical properties were evaluated under various forward currents; these properties included the electroluminescence spectra and luminous efficiency of CIS/ZnS QDs-assisted white LEDs. These results clearly showed that CIS/ZnS QDs are promising candidates for application in white LEDs.
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Collections - Graduate School > Materials Science and Engineering > 1. Journal Articles
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