TELKOMNIKA Telecommunication, Computing, Electronics and Control
Excellent color quality of phosphor converted white light emitting diodes with remote phosphor geometry
Dublin Core
Title
TELKOMNIKA Telecommunication, Computing, Electronics and Control
Excellent color quality of phosphor converted white light emitting diodes with remote phosphor geometry
Excellent color quality of phosphor converted white light emitting diodes with remote phosphor geometry
Subject
Color quality, Lumen output, Mie-scattering theory, WLEDs, Y2O2S:Tb3+, ZnS:Sn2+
Description
The advantage in using a remote phosphor design in a WLED package is
the superior luminous flux to that of the conformal and in-cup phosphor
geometries. However, the disadvantage is its color quality which is lower than the results from the other two structures. This study suggests using two layers of phosphor for the remote phosphor configuration to improve the light chromaticity, including color rendering index (CRI) and color quality scale (CQS), for WLED packages with color temperature of 8500 K. The main concept of this research is to locate a green Y2O2S:Tb3+ or red ZnS:Sn2+ phosphor layer on the yellow YAG:Ce3+ phosphor film, and then finding a suitable ZnS:Sn2+ concentration to match the highest color quality. The results showed that ZnS:Sn2+ brings great benefits to the increase of CRI and CQS. The greater the ZnS:Sn2+ concentration is, the better the CRI and CQS become owing to the rise of red-light components in WLED packages. Meanwhile, the green Y2O2S:Tb3+ phosphor brings benefits to the lumen output. However, a decrease in the luminescence and chromatic homogeneity
appears when the concentrations of ZnS:Sn2+ or Y2O2S:Tb3+ exceed
the corresponding level. This finding is verified by applying the Mie-scattering theory and the Lambert-Beer's law. The results of this article are important for the production of high-performance WLEDs in the modern lighting market.
the superior luminous flux to that of the conformal and in-cup phosphor
geometries. However, the disadvantage is its color quality which is lower than the results from the other two structures. This study suggests using two layers of phosphor for the remote phosphor configuration to improve the light chromaticity, including color rendering index (CRI) and color quality scale (CQS), for WLED packages with color temperature of 8500 K. The main concept of this research is to locate a green Y2O2S:Tb3+ or red ZnS:Sn2+ phosphor layer on the yellow YAG:Ce3+ phosphor film, and then finding a suitable ZnS:Sn2+ concentration to match the highest color quality. The results showed that ZnS:Sn2+ brings great benefits to the increase of CRI and CQS. The greater the ZnS:Sn2+ concentration is, the better the CRI and CQS become owing to the rise of red-light components in WLED packages. Meanwhile, the green Y2O2S:Tb3+ phosphor brings benefits to the lumen output. However, a decrease in the luminescence and chromatic homogeneity
appears when the concentrations of ZnS:Sn2+ or Y2O2S:Tb3+ exceed
the corresponding level. This finding is verified by applying the Mie-scattering theory and the Lambert-Beer's law. The results of this article are important for the production of high-performance WLEDs in the modern lighting market.
Creator
Thinh Cong Tran, Nguyen Doan Quoc Anh, Nguyen Thi Phuong Loan
Source
DOI: 10.12928/TELKOMNIKA.v18i5.13575
Publisher
Universitas Ahmad Dahlan
Date
October 2020
Contributor
Sri Wahyuni
Rights
ISSN: 1693-6930
Relation
http://journal.uad.ac.id/index.php/TELKOMNIKA
Format
PDF
Language
English
Type
Text
Coverage
TELKOMNIKA Telecommunication, Computing, Electronics and Control
Files
Collection
Citation
Thinh Cong Tran, Nguyen Doan Quoc Anh, Nguyen Thi Phuong Loan, “TELKOMNIKA Telecommunication, Computing, Electronics and Control
Excellent color quality of phosphor converted white light emitting diodes with remote phosphor geometry,” Repository Horizon University Indonesia, accessed September 20, 2024, https://repository.horizon.ac.id/items/show/4035.
Excellent color quality of phosphor converted white light emitting diodes with remote phosphor geometry,” Repository Horizon University Indonesia, accessed September 20, 2024, https://repository.horizon.ac.id/items/show/4035.