Design of an optical illumination system for a tunable source with acousto-optical filtering

Romanova, Galina E.; Batshev, V. I.; Beliaeva, Alina S.

doi:10.1364/jot.88.000066

Cited by 8 publications

(7 citation statements)

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“…LaOF:Eu 3+ compounding is formed by chemical reactions between La2O3, Eu2O3, and LaF3 [17]. Table 1 calculates the detailed composition of LaOF:Eu 3+ phosphor.…”

Section: Methods 21 Composition Of Laof:eu 3+ Phosphormentioning

confidence: 99%

SiO2@LaOF:Eu3+ in white light emitting diodes optic efficiency enhancement

Huu

Luo²,

Quang³

2022

Bulletin EEI

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The earliest intense red hue compound of SiO2@LaOF:Eu3+ core-shell nanostructures (NS) was created utilizing a basic solvothermal technique and heat processing. The produced core-shell particles are spherical, non-agglomerated, and have restricted size dispersion. Photoluminescence (PL) radiation spectra exhibit sharp maximums in 593, 611, and 650 nm, corresponding with 5D0 -- 7FJ (J=0, 1, 2) Eu3+ conversions. The Judd-Ofelt (J-O) hypothesis helps determine the spectrum strength indices and Eu-O ligand activities. The CIE coordinates are x=0.63, y=0.36, nearly equal the NTSC coordinates which are x=0.67, y=0.33. Because of the CCT level of 3475 K, which is lower than 5000 K, this phosphor is appropriate for warm light-emitting diodes. To visualize latent fingermarks both porous and non-porous substrates, the fluorescent labeling marker adapted core-cover SiO2 (coat III)@LaOF:Eu3+ (5 mol%) was utilized. With no background influence, the fingermarks obtained are exceedingly sensible and exclusive, permitting for fingerprint ridge features ranging from level-I to level-III. The findings indicate the significant enhancement in the illumination of corecover NS as a responsive operational nanoparticle for increased forensics and firm status illuminating implementations.

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“…LaOF:Eu 3+ compounding is formed by chemical reactions between La2O3, Eu2O3, and LaF3 [17]. Table 1 calculates the detailed composition of LaOF:Eu 3+ phosphor.…”

Section: Methods 21 Composition Of Laof:eu 3+ Phosphormentioning

confidence: 99%

SiO2@LaOF:Eu3+ in white light emitting diodes optic efficiency enhancement

Huu

Luo²,

Quang³

2022

Bulletin EEI

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“…Furthermore, when concentrations increased, the gaussian regions correlative magnitude lay at the values of 310 and 400 nm in stimulation spectrum increased higher over the other two regions, reflecting a rise in Eu 2+ occupancy at smaller Ca(1) sites. However, as the concentration of Eu 2+ increased to 3.0 mol%, both the stimulation and emission maxima redshifted slightly, which is assumed to be due to increased Eu 2+ crystalline sector breaking in the sites of Ca(2) [24], [25].…”

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

confidence: 95%

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

Huu

Thi

2022

Bulletin EEI

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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.

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“…Improving optical properties of white light-emitting diodes using triple … (Binh Thanh Ly) 1249 YAl3B4O12:Eu 3+ and green Zn2SiO4:Mn 2+ ,As 5+ phosphors can compensate for the lack of red and green lights needed for white light while preventing emitted light from reflecting back inside the package. Only the phosphor concentration needed to be modified correctly for the optimal performnaces, which can be referred to the Lambert-Beer law in (7). The color deviation values, which can be seen from Figure 7, show the better consistency in the TLP structure than in the DLP structure, owing to the lower color deviation of TLP configuration.…”

Section: Figure 5 Cqs Performances Of Corresponding To Accts Of Dlpmentioning

confidence: 99%

“…This configuration of WLEDs was simple and had low manufacturing costs while still accomplishing an adequate level of performance but not suitable for lighting applications with higher demands. In particular, these conventional WLEDs showed high thermal discharge which lowered the working hours, changed the color temperature, affected light consistency, and projected less light with distorted light color after a period of time [6], [7]. The incompatible refractive index between 1.5 of YAG:Ce 3+ yellow phosphor and 1.8 of organic encapsulation became an obstacle that prevented the emitted light from being freely transferred out of the device, which caused part of the total light to be trapped and re-absorbed [8], [9].…”

Section: Introductionmentioning

confidence: 99%

Improving optical properties of white light-emitting diodes using triple-layer remote structure

2022

IJEECS

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Inrecent efforts to improve the performance ofwhite light-emitting diode (WLEDs), researchers have focused on angular color uniformity (ACU), an effective index for evaluating the light quality of WLEDs. Inthis article, we also aim for the WLED development by applying three phosphor layers in the remote phosphor structure. The dual-layer phosphor (DLP) remote structure is also included in the research for comparison with the triple-layer phosphor (TLP) in terms of their impacts on the lighting quality of WLEDs. To ensure the diversity and applicability in different scenarios, performancesof multi-layer phosphor structures in WLED devices with average correlatedcolor temperatures (ACCTs) from 5600 K to 8500K are measured. The experimental results have proved that both TLP and DLP structures are suitable to enhance WLEDs’ performance as each structure excels at specific qualities. In particular, at all ACCTs, the DLP structure is getting better in improvingthe color rendering index (CRI), while the TLP is more advantageous to color quality scale (CQS) and light output. The TLP also presents a lower color deviation than the DLP does, which leads to a better color uniformity in WLEDs at all ACCTs.

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Design of an optical illumination system for a tunable source with acousto-optical filtering

Cited by 8 publications

References 0 publications

SiO2@LaOF:Eu3+ in white light emitting diodes optic efficiency enhancement

SiO2@LaOF:Eu3+ in white light emitting diodes optic efficiency enhancement

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

Improving optical properties of white light-emitting diodes using triple-layer remote structure

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