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

Nguyen Thi Phuong Loan

Nguyen Thi Phuong Loan

Faculty of Electrical and Electronics Engineering, Ton Duc Thang UniversityHo Chi Minh City, Vietnam
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Loan, Nguyen Thi Phuong
, 
Nguyen Doan Quoc Anh

Nguyen Doan Quoc Anh

Faculty of Electrical and Electronics Engineering, Ton Duc Thang UniversityHo Chi Minh City, Vietnam
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Anh, Nguyen Doan Quoc
, 
Nguyen Cong Trang

Nguyen Cong Trang

Faculty of Electrical and Electronics Engineering, Ton Duc Thang UniversityHo Chi Minh City, Vietnam
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Trang, Nguyen Cong
 und 
Hsiao-Yi Lee

Hsiao-Yi Lee

Department of Electrical Engineering, National Kaohsiung University of Science and TechnologyKaohsiung, Taiwan
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Lee, Hsiao-Yi
  
12. Juni 2022
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Online veröffentlicht: 12. Juni 2022
Seitenbereich: 60 - 67
Eingereicht: 19. Mai 2021
Akzeptiert: 23. Sept. 2021
DOI: https://doi.org/10.2478/msp-2022-0010
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© 2022 Nguyen Thi Phuong Loan et al., published by Sciendo
This work is licensed under the Creative Commons Attribution-NonCommercial-NoDerivatives 4.0 International License.

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

Ingredients Mole (%) By weight (g)
La2O3 95 (of La) 155
Eu2O3 5 (of Eu) 8.8
Li2CO3 101 (of Li) 37.4

The green phosphor Zn2GeO4:Mn2+ composition

Ingredients Mole (%) By weight (g)
ZnO 90 73.2
MgF2 5 3.1
MnCO3 5 5.8
GeO2 55 57.5
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