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Better color distribution uniformity and higher luminous intensity for LED by using a three-layered remote phosphor structure

Authors
  • Loan, Nguyen Thi Phuong
  • Anh, Nguyen Doan Quoc
  • Trang, Nguyen Cong
  • Lee, Hsiao-Yi
Type
Published Article
Journal
Materials Science-Poland
Publisher
Sciendo
Publication Date
Jun 12, 2022
Volume
40
Issue
1
Pages
60–67
Identifiers
DOI: 10.2478/msp-2022-0010
Source
De Gruyter
Keywords
License
Green

Abstract

Angular color distribution uniformity has been one of the most relevant properties in the development of white light-emitting diodes (WLEDs), since color consistency and uniformity are crucial factors in quality evaluation of a WLED. Here, particularly considering the need to overcome the poor chromaticity usually associated with WLED, we introduce a new design for the remote-phosphor package, namely a three-layered or triple-layer (TL) phosphor structure. Using three phosphor layers in packaging a WLED can result in higher color quality and luminous efficacy, compared to the double-layer (DL) configuration. In the present study, the results of using three remote phosphor layers indicate that although the structure using three layers has a lower color rendering index, the color quality scale is better than that available from the package with two layers. Additionally, the color-deviation values in the TL structure are smaller than in the dual-layer one, especially at high color temperatures (7,700 K and 8,500 K). Besides, in comparison with the DL model, the TL package increases the luminous flux by 1.4%–2%. Therefore, the TL remote phosphor structure possesses the greatest potential in enhancing the WLED quality.

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