Red-Shifted Absorption of a Mn4+-Doped Germanate Phosphor by Crystal Distortion

Lim, Tae Gil; Ahn, Yong Nam; Park, Hyun Woo; Yoo, Jae Soo

doi:10.1149/2.0241801jss

Cited by 4 publications

(3 citation statements)

References 28 publications

(29 reference statements)

Supporting

Mentioning

Contrasting

Order By: Relevance

“…Only the β phase appears to be stable in the Eu 2+ doped Ca2SiO4 phosphor. As a result, the Eu 2+ ions in Ca2SiO4 at high temperatures can stabilize the β phase [20]. The phase conversion during the SSR procedure is caused by the non-homogeneous dispersion of Eu 2+ atoms throughout the host matrix.…”

Section: Computational Simulation 21 X-ray Diffraction Analysis For C...mentioning

confidence: 99%

Using liquid phase precursor method to create a high-efficiency Ca2SiO4:Eu2+ green-emitting phosphor

Huu

Thi

2022

Bulletin EEI

View full text Add to dashboard Cite

A standard solid-state reaction (SSR), a new fluid phase preparatory method utilizing LPP-SiO2(sol), and a water-based soluble silicone compound were employed to manufacture green Eu2+-based Ca2SiO4 phosphors liquid phase precursor (LPP-WSS). The generated phosphors feature large excitation spectra in the range of 225–450 nm and a strong green emission reaches the peak value at 502 nm owing to a 4f65d1→4f7(8S7/2) transition of Eu2+. These samples burned at 1100 1C produce the highest luminous intensity. The luminous properties of phosphors, which are manufactured by the liquid phase precursor LPP-WSS technique, were investigated at the range of 0.1-5.0 mol percent of Eu2+, with the maximum emission density observed at the value of 3.0 mol percent of Eu2+. The phosphors produced by the LPP-WSS technique exhibited a more uniform phase dispersion and higher luminous strength than those produced using the other procedures, according to a detailed report based on numerous characterizations. As a result, Ca2SiO4:Eu2+ has an indisputable possibility in white light-emitting diodes WLEDs and fluorescent lighting.

show abstract

Section: Computational Simulation 21 X-ray Diffraction Analysis For C...mentioning

confidence: 99%

Using liquid phase precursor method to create a high-efficiency Ca2SiO4:Eu2+ green-emitting phosphor

Huu

Thi

2022

Bulletin EEI

View full text Add to dashboard Cite

show abstract

“…The symbols 𝛽(𝜃, 𝜆, 𝑟), S1(θ) and S2(θ), which indicates angular scattered amplitudes, are determined by the formulas [24]- [26]:…”

Section: Scattering Computationmentioning

confidence: 99%

Two-layer remote phosphor package as a solution to promote color quality scale and lumen in WLEDs

Huu

Thi

2022

Bulletin EEI

View full text Add to dashboard Cite

This article demonstrates the influence of the red-light LaAsO4:Eu3+ phosphorus on the optical features of the two structures: one-layer remote phosphorus scheme (SRPS) and two-layer remote phosphorus scheme (DRPS). As a result, the Mie hypothesis is used to demonstrate and prove the comparison between color quality and luminosity (LF) between these two factors. The SRPS is a phosphor layer that consists of LaAsO4:Eu3+ particles combined with the YAG:Ce3+ mixture. Meanwhile, DRPS is two phosphor layers of red and yellow separated from each other. To improve the dispersing property, 5% of SiO2 is combined with the phosphorous films. The difference between the structures influences the optical features of WLEDs. The obtained outcomes show that the color rendering index (CRI) rises along with the concentrations of both structures while these values are nearly identical to each other. Meanwhile, at ACCTs (5600 K - 8500 K), the color quality scale (CQS) in DRPS reaches 74, which is higher than SRPS's 71 at 8500 K. Besides, the lumen in DRPS is considerably greater than that in SRPS at 2%-14% LaAsO4:Eu3+. In short, DRPS brings considerable benefits to the color quality and lumen when compared to SRPS. In addition, choosing a suitable concentration also becomes highly vital to achieve desirable CQS and LF.

show abstract

“…Apart from the down-conversion energy loss of phosphors, until now, no one has investigated the photometric optimization of the CCT-adjustable WLED using remote phosphor configurations (RPCs) with high CRI. Hence, an urge to demonstrate a photometric optimization model for a CCT-changeable WLED model, which accesses the down-conversion energy loss, with a great level of CRIs has emerged in the research field [16]- [18]. By satisfying the criteria at CCTs 2700 K to 6500 K, both CRI and R9 over 98, with differences in color shades below 0.0054, assessed from the Planckian or daylight locus on the CIE 1960 UV chromatic diagram (Duv).…”

Section: Introductionmentioning

confidence: 99%

For improvements in chromatic scales and luminescent fluxes of white lights: developing a dual-layer remote phosphor structure

Bui

Loan²,

Tran³

2023

TELKOMNIKA

View full text Add to dashboard Cite

This study compares red-phosphor LaOF:Eu 3+ impacts on a single-film remote phosphor configuration (SRPC) and a double-film remote phosphor configuration (DRPC). Mie theory is used to demonstrate the relationship between light flux and color quality. SRPC is a phosphor layer consisting of LaOF:Eu 3+ particles mixed with YAG:Ce 3+ . Meanwhile, DRPC is two separate films of red and yellow phosphors. To increase scattering properties, we added 5% SiO2 into phosphor layers. The differences in structure affect significantly white light emitting diodes' (WLEDs') optical properties. Attained figures and statistics show that the color rendering indices (CRIs) increase along with the concentrations of both structures, and these numbers are approximately similar. However, DPRC exhibits a color quality scale (CQS) of 74 in all examined chromatic temperatures (5600 K − 8500 K), which is greater than SRPC's 71 at 8500 K. Besides, the luminous efficiencies (LEs) in DRPC are more outstanding than that of SRPC, at given LaOF:Eu 3+ concentration percentages (2%−14%). To summarize, DRPC offers greater benefits in luminous flux and color quality, compared to SRPC. Choosing the proper red light phosphor concentration, on the other hand, becomes a crucial aspect of achieving the ideal CQS and LEs.

show abstract

Red-Shifted Absorption of a Mn⁴⁺-Doped Germanate Phosphor by Crystal Distortion

Cited by 4 publications

References 28 publications

Using liquid phase precursor method to create a high-efficiency Ca<sub>2</sub>SiO<sub>4</sub>:Eu<sup>2+</sup> green-emitting phosphor

Using liquid phase precursor method to create a high-efficiency Ca<sub>2</sub>SiO<sub>4</sub>:Eu<sup>2+</sup> green-emitting phosphor

Two-layer remote phosphor package as a solution to promote color quality scale and lumen in WLEDs

For improvements in chromatic scales and luminescent fluxes of white lights: developing a dual-layer remote phosphor structure

Contact Info

Product

Resources

About