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Ton Duc Thang University (TDTU) is a public university with the main campus located in vibrant Ho Chi Minh City, Vietnam’s economic and educational hub. Founded in 1997, TDTU has developed into one of the largest and fastest growing universities in Vietnam with more than 22,000 students, enrolled in undergraduate and graduate programs ranging from science, engineering to business management, law, and humanities. To foster the country’s human resources and best serve the nation in the knowledge based economy of the 21st century, TDTU is combining vocational training with high-level research. The establishment of JAEC is one of TDTU’s efforts in this direction. More

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  • Vol 9, No 1 (2025)
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The use of orange-red emitting Ba2Ca(BO3)2:Sm3+ phosphor to improve chromaticity and luminance of conventional white leds

Nguyen Thi Phuong Thao, Hsiao Yi Lee

Abstract


The characteristics of configuration and illumination of Sm3+ incorporated Ba2Ca(BO3)2 samples produced using the traditional solid-status approach are discussed in this study. The luminescence measurement of the prepared red phosphor and phosphor-conversion sheet for white light emitting diodes (WLED) were conducted with Mie-scattering Monte Carlo simulation and MATLAB computation. The phosphor demonstrated a broad emission range with the prominent emission peak at ~601 nm under the 402 nm radiation, originated from the Sm3+ ion’s 4G5/2 and 6H7/2 transfer. The use of Ba2Ca(BO3)2:Sm3+ (abbreviation is BC(BO):Sm) in combination with CaCO3 nanoparticles and yellow phosphor to form a conversion layer demonstrates the increase in red spectrum band of the generated white light. By varying the concentration of CaCO3 amount and maintain the BC(BO):Sm concentration constant, the improvement in specific properties of WLED can be accomplished. According to the findings, the phosphor Ba2Ca(BO3)2:Sm3+ can be utilized with a near ultraviolet (n-UV) or blue chip for producing quality-enhanced WLEDs.


Keywords


Ba2Ca(BO3)2; X-ray diffraction; BO3 and BO4; red spectrum; LEDs

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DOI: http://dx.doi.org/10.55579/jaec.202591.475

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Creative Commons License
This work is licensed under a Creative Commons Attribution 4.0 International License.