White LED light source radar system for multi-wavelength remote sensing measurement of atmospheric aerosols

Zhong, Wei; Liu, Jun; Hua, Dengxin; Guo, Sasa; Yan, Ke; Zhang, Chen

doi:10.1364/ao.58.008542

Cited by 13 publications

(13 citation statements)

References 14 publications

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“…Under ultraviolet (UV) illumination, the currency frequently displays luminescence designs. Furthermore, nano ions such as natural chemicals, carbon nanoparticles, and semiconductor substances are used, yet their extended-term toxicity or wide radiation ranges prevent them from being used in other implementations [24]- [26]. But lanthanide-doped nanostructured phosphors exhibit outstanding spectral fingerprints and many benefits, e.g., being hard to make replicas, having minor toxicities, and having great longevity, resulting in their potential implementations in the anticounterfeiting area (see Figure 6).…”

Section: Resultsmentioning

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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Section: Resultsmentioning

confidence: 99%

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

Huu

Luo²,

Quang³

2022

Bulletin EEI

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“…Additionally, the slope (-θ/3) was detected at about -1.92. Consequently, θ can be computed to be 5.76, relatively equal to 6, indicating that the mechanism of Eu 2+ -ion concentration quenching was controlled by the dipole-dipole interaction [10], [20]. The replacement of Sr 2+ cation to Ba 2+ one was responsible for the strength enhancement of the crystal field, in connection with the reduction in bond length, whose relation can be demonstrated as [21], [22].…”

Section: Green-blue Emitting (Basr)3bp3o12:eu 2+ Phosphor Preparationmentioning

confidence: 99%

The impacts of (Ba,Sr)3BP3O12:Eu2+ on the luminous flux of phosphor-converted-white light emitting diode packages

Bui

Thi

2022

IJEECS

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The use of (Ba,Sr)3BP3O12:Eu2+ in the remote phosphor structure has been proposed and analysed to offer significant improvement to the lighting performance of the phosphor-converted white light emitting diode (LED). The phosphor emits green and blue spectra centred at 520 nm and 465 nm, respectively. Thus, the phosphor can compensate the blue and green light energy components in the white-light spectral band, helping to enhance the luminous efficiency and colour uniformity of the dual-layer remote phosphor package. The increase in (Ba,Sr)3BP3O12:Eu2+ however is not advantageous to the colour rendering index because of the lower red emission. The backscattered and back-reflected lights are degraded when the (Ba,Sr)3BP3O12:Eu2+ phosphor layer appears in the structure. The stable chromaticity and luminous flux at good values are observed when 10% weight percentage of (Ba,Sr)3BP3O12:Eu2+ is applied.

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“…As previously established, altering the dissolvent (methanol or ethanol), quantity for participating ingredients in the reacting process (H2O, TEOS), as well as ammonium hydroxide (NH4OH) catalyst resulted in SiO2-nanoparticle production with particle sizes ranging from 10 to 450 nm. It is reported that as the concentrations of TEOS and NH4OH decreased, and the content of water increased, the size of particles showed a decline [23], [24]. Accordingly, the solvents utilized for synthesizing the nearly monodisperse silica nanoparticles (particle size ranging from 50 nm to 450 nm) and the silica nanoparticles (particle size from 10 nm to 50 nm) were ethanol and methanol, respectively.…”

Section: Scattering Computationmentioning

confidence: 99%

The effects of SiO2@Y2O2S:Eu3+ phosphor on the optic characteristics of white light-emitting diodes

Bui

2022

IJEECS

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The study investigated the effectiveness of coating silica nanoparticles (SiO2) and resin-silica nanocomposites poly methyl methacrylate (PMMA)-silicaover the surface of Y2O2S:Eu3+ red phosphors. The purpose of this surface coating is to enhance the optical properties, including the photoluminescence (PL) and long-term stability, of Y2O2S:Eu3+. Two methods used to coat the phosphor with 5-mm silica nanoparticles are dip-coating and sol-gel (Stöber) methods. SiO2 nanoparticles were formed via hydrolysis and condensation reactions, while radical polymerization was performed to fabricate the poly (1-vinyl-2-pyrrolidone). The Y2O2S:Eu3+ surface coating of PMMA-silica composite was performed via two reactions. One is the reaction of SiO2 nanoparticles with methyl methacrylate (MMA) monomer, and the other is MMA-tetraethyl orthosilicate (TEOS) reaction. The results showed that by using the latter method, Y2O2S:Eu3+ yielded better PL and long-term stability. Additionally, surface coating with the PMMA-SiO2 nanocomposite using the second technique resulted in 5% enhancement in PL and stabilized the cathode luminescence (CL) intensity of Y2O2S:Eu3+, compared to those properties of uncoated Y2O3S:Eu3+ phosphor particles.

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White LED light source radar system for multi-wavelength remote sensing measurement of atmospheric aerosols

Cited by 13 publications

References 14 publications

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

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

The impacts of (Ba,Sr)3BP3O12:Eu2+ on the luminous flux of phosphor-converted-white light emitting diode packages

The effects of SiO2@Y2O2S:Eu3+ phosphor on the optic characteristics of white light-emitting diodes

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