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

Materials Science-Poland
Volume 40 (2022): Issue 1 (March 2022)
By:
Open Access
|Jun 2022

Figures & Tables

Fig. 1

Schematic diagrams of (A) DL remote phosphor configuration, (B) TL remote phosphor configuration. DL, double-layer; TL, triple-layer
Schematic diagrams of (A) DL remote phosphor configuration, (B) TL remote phosphor configuration. DL, double-layer; TL, triple-layer

Fig. 2

Changes in yellow YAG:Ce3+ phosphor concentration in two remote phosphor structures at five CCTs
Changes in yellow YAG:Ce3+ phosphor concentration in two remote phosphor structures at five CCTs

Fig. 3

Emission spectra of DL and TL phosphor structures. DL, double-layer; TL, triple-layer
Emission spectra of DL and TL phosphor structures. DL, double-layer; TL, triple-layer

Fig. 4

CRI values of DL and TL phosphor configurations at each CCT. CRI, color rendering index; CCT, correlated color temperature; DL, double-layer; TL, triple-layer
CRI values of DL and TL phosphor configurations at each CCT. CRI, color rendering index; CCT, correlated color temperature; DL, double-layer; TL, triple-layer

Fig. 5

CQS values of DL and TL phosphor configurations at each CCT. CQS, color quality scale; CCT, correlated color temperature; DL, double-layer; TL, triple-layer
CQS values of DL and TL phosphor configurations at each CCT. CQS, color quality scale; CCT, correlated color temperature; DL, double-layer; TL, triple-layer

Fig. 6

Luminous output (LO)
Luminous output (LO)

Fig. 7

Color deviation (D-CCT) of TL and DL phosphor configurations at each CCT. CCT, correlated color temperature. DL, double-layer; TL, triple-layer
Color deviation (D-CCT) of TL and DL phosphor configurations at each CCT. CCT, correlated color temperature. DL, double-layer; TL, triple-layer

The red phosphor LiLaO2:Eu3+ composition

IngredientsMole (%)By weight (g)
La2O395 (of La)155
Eu2O35 (of Eu)8.8
Li2CO3101 (of Li)37.4

The green phosphor Zn2GeO4:Mn2+ composition

IngredientsMole (%)By weight (g)
ZnO9073.2
MgF253.1
MnCO355.8
GeO25557.5
DOI: https://doi.org/10.2478/msp-2022-0010 | Journal eISSN: 2083-134X | Journal ISSN: 2083-1331
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Language: English
Page range: 60 - 67
Submitted on: May 19, 2021
Accepted on: Sep 23, 2021
Published on: Jun 12, 2022
Published by: Sciendo
In partnership with: Paradigm Publishing Services
Publication frequency: 4 times per year
Keywords:
WLEDs,
luminous efficacy,
color uniformity,
remote phosphor structure,
three-layered remote phosphor structure
Related subjects:
Materials sciences,
Materials sciences, other,
Nanomaterials,
Functional and smart materials,
Materials characterization and properties

© 2022 Nguyen Thi Phuong Loan, Nguyen Doan Quoc Anh, Nguyen Cong Trang, Hsiao-Yi Lee, published by Sciendo
This work is licensed under the Creative Commons Attribution-NonCommercial-NoDerivatives 4.0 License.

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