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All Journal TELKOMNIKA (Telecommunication Computing Electronics and Control) Science and Technology Indonesia
Nguyen Doan Quoc Anh
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Biochemistry, Genetics & Molecular Biology Chemical Engineering, Chemistry & Bioengineering Computer Science & IT Environmental Science Materials Science & Nanotechnology Physics

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Acquiring higher lumen efficacy and color rendering index with green NaYF4:Er3+Yb3+ and red α-SrO·3B2O3:Sm2+ layers for designing remote phosphor LED My Hanh Nguyen Thi; Nguyen Thi Phuong Loan; Nguyen Doan Quoc Anh
TELKOMNIKA (Telecommunication Computing Electronics and Control) Vol 18, No 6: December 2020
Publisher : Universitas Ahmad Dahlan

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.12928/telkomnika.v18i6.13796

Abstract

Lighting devices that apply diodes to create white light-emitting diodes (WLEDs) can achieve remarkable results in color quality, especially those containing quantum dots (QDs) and phosphor. The technique to create an appropriate package is providing spaces between the QDs and phosphor components which helps decrease the ratio of the reabsorption losses and keeps the QDs surface ligands constant. The research aims to perfect the constructing method of remote phosphor configuration containing quantum dots and phosphor materials that based on lighting properties and temperature feature of WLEDs. The infrared thermography is the tool to measure and analyze total emitted light and emission ranges of the device. This device is also used in temperature simulation and experimental verification. At the given mA of 60, the WLEDs structure with green QDs layer above the phosphor layer results in 996 lm luminous flux (LF), and Ra = 57 in color rendering ability. Meanwhile, luminous flux of WLEDs with red QDs-on-phosphor structure is 632, and Ra = 70. Furthermore, comparing with the green QDs-on-phosphor type, the red QDs-on-phosphor type emitted less LF. However, the red QDs-on-phosphor type can be the most effective package design to achieve color rendering ability.
Assessing Thermic Degradation for Yttrium–aluminum Precursive Agents Applied to YAG Phosphor Samples Nguyen Thi Phuong Loan; Nguyen Doan Quoc Anh; Phan Thi Minh Man; Hsiao-Yi Lee
Science and Technology Indonesia Vol. 10 No. 4 (2025): October
Publisher : Research Center of Inorganic Materials and Coordination Complexes, FMIPA Universitas Sriwijaya

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.26554/sti.2025.10.4.1209-1214

Abstract

Several forms of precursive agents were made via the soggy chemical approach, beginning with yttrium–europium–aluminum nitrate (YEAN) compoundaswell as disparate precipitants, comprising urea, oxalic acid, as well as ammonium carbonate. The precursive agents were heat-treated within nitrogen aerosphere for acquiring Y3Al5O12:Eu3+ featuring garnet formation YAG:Eu. Procedures employed for thermic degradation as well as constitution for precursive agents were validated via thermic assessment as well as FTIR spectroscopic assessment. Relationship among thermic degradation stages, as well as gaseous constitution developed throughout thermic procedure was identified via the merger between thermic assessment as well as FTIR. Ultimately, the disparate constitution for precursive agents signifies the luminescent attributes for matching phosphor samples. Urea as well as ammonium carbonate generate YAG samples featuring garnet formation as well as certain red discharge. Regarding oxalic acid, the precipitant yields an ununiform sample featuring yttrium oxide in the form non-pure stage. Said sample would be a merger between Y2O3:Eu3+,Y4Al2O9:Eu3+, as well as Y3Al5O12:Eu3+, yielding greater discharge intenseness. When used in tandem with YAEN, AlAs was investigated for its particle size’s effect on optical properties, such as scattering coefficient, YAG:Ce concentration, correlated color temperature (CCT), chroma aberration, lumen, and color rendition. It was found out 19 wt.% would be the most optimal particle size when all of these properties are taken into account.
Co-Authors Hsiao-Yi Lee My Hanh Nguyen Thi Nguyen Thi Phuong Loan Nguyen Thi Phuong Loan Phan Thi Minh Man