Comparison between SEPs of CaCO3 and TiO2 in phosphor layer for better color uniformity and stable luminous flux of WLEDs with 7,000 K

• Autorzy: Le Phan Xuan , Trang Tran Thanh , Anh Nguyen Doan Quoc , Lee Hsiao-Yi , Tho Le Van

Identyfikatory

DOI

10.2478/msp-2022-0008

• Języki publikacji: EN

Abstrakty

EN

CaCO₃ and TiO₂ are proposed in this study as particles for scattering enhancement (SEPs) of phosphor-converted white light-emitting diodes (pc-WLEDs). The use of these two SEPs for scattering improvement enables boosting of the color homogeneity of the WLED devices. Each SEP is mixed with YAG:Ce³⁺ and silicone composition to examine their optical influences and performances on the high-power WLED packages with 7,000 K color temperature (CT). Miescattering theory is applied to calculate and investigate the scattering elements - scattering coefficients, anisotropic scattering, the reduced scattering, and scattering amplitudes - at the wavelengths of 450 nm and 550 nm. The results exhibit that TiO₂and CaCO₃ considerably promote higher color uniformity and color-deviated reduction, respectively. The obtained results could be primarily attributed to the significant improvement in the scattering properties of the structure. Additionally, the effects of the presented scattering enhancement on luminous efficiency are displayed. The reduction in lumen output is observed to have a close connection with the concentration and particle size of TiO₂and CaCO₃, which means that control must be exercised over these factors when utilizing these SEPs for WLED fabrication.

Słowa kluczowe

EN

WLEDs; scattering enhancement; luminous efficiency; color quality; CaCO3; TiO2

• Wydawca: De Gruyter
• Czasopismo: Materials Science Poland
• Rocznik: 2022
• Tom: Vol. 40, No. 1
• Strony: 1--8
• Opis fizyczny: Bibliogr. 25 poz., rys.

Twórcy

autor

Le Phan Xuan

• Faculty of Mechanical – Electrical and Computer Engineering, School of Engineering and Technology, Van Lang University,Ho Chi Minh City, Vietnam

autor

Trang Tran Thanh

• Faculty of Electrical and Electronics Engineering, HCMC University of Food Industry, Ho Chi Minh City, Vietnam

autor

Anh Nguyen Doan Quoc

• Faculty of Electrical and Electronics Engineering, Ton Duc Thang University, Ho Chi Minh City, Vietnam

autor

Lee Hsiao-Yi

• Department of Electrical Engineering, National Kaohsiung University of Science and Technology, Kaohsiung City, Taiwan

autor

Tho Le Van

• Institute of Tropical Biology, Vietnam Academy of Science and Technology, Ho Chi Minh City, Vietnam

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