Enhancement of luminescence and thermal stability in Sr2.92-xTmxSiO5:Eu2+ for white LEDs

Peng, Lingling; Qiang, Qinping; Cao, Shixiu; Chen, Wenbo; Han, Tao

doi:10.1088/1402-4896/abcf67

Cited by 3 publications

(2 citation statements)

References 21 publications

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“…To create varied composite structures, a huge proportion of hard and soft layouts are utilized. Because of its tunable sizes, silica is a common template being used for core-shell structured components [1]- [3]. If nanomaterials are coated as covers of silicate cores, a spherical morphology core-shell phosphor is formed.…”

Section: Introductionmentioning

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: Introductionmentioning

confidence: 99%

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

Huu

Luo²,

Quang³

2022

Bulletin EEI

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“…The phosphor concentration has a considerable impact on the lumen efficiency, in addition to the package layout. The ri se in the concentration of phosphor can increase the loss of re-absorption in the layer of phosphor, and as a result, the lumen performance may suffer, especially as the correlated color temperature lowers [23]. According to several pieces of researches, excessive dispersion and reflecting events have a negative impact on lumen performance.…”

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Application of dual-layer phosphor geometries for enhancing the optical properties of white-light LEDs

That

Lee

2022

TELKOMNIKA

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This article compares the lumen output of two packages of two-remote phosphor (RP). The first package is flat dual-remote phosphor (FDRPS). The second package is concave dual-remote phosphor (CDRP). The dispersion qualities of the white-light-emitting diode are different as a result of their different cover designs, leading to a disparity between the FDRPS and CDRPS configurations. The results of the study show that the FDRPS package yields a lumen output superior to that of the CDRPS package. In the article, we can also see how the space among the phosphor films (𝑑 1 ) and the space among the phosphor film and the light emitting diodes (LED) outer side (𝑑 2 ) might affect the light characteristics in the CDRPS model. As the indicated distances shift, the characteristics of dispersion and absorptivity in the distant phosphor film will shift as well. Such an occurrence can have an impact on chromatic uniformity as well as optical performance in white light emitting diodes (WLEDs). If we modify the 𝑑 1 and 𝑑 2 values, it is necessary to change the phosphor YAG:Ce 3+ concentration in the WLEDs to keep the correlated color temperature at 8500 K.

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Tunable Optical Properties, Enhanced Photoluminescence, and Thermostability of CaO: Eu^2+/3+ Phosphors by Codoping Cl^– Ions

Liu,

Wang,

Jing

et al. 2024

Inorg. Chem.

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Europium-activated calcium oxide (CaO: Eu) phosphor shows great potential in the fabrication of light-emitting diodes (LEDs). However, its luminescent intensity and thermostability still need to be further enhanced. In this work, the photoluminescence property and thermostability of CaO: Eu 2+/3+ were improved significantly by codoping a few of Cl − ions into it. Compared with CaO: Eu 2+/3+ samples, CaO: Eu 2+/3+ , Cl − phosphors not only have tunable luminescence but also show stronger luminescence intensity and thermal stability. The emission color of phosphors can be tuned by changing the excitation wavelength; typically, strong red/blue light can be displayed under 250/362 nm excitation. More importantly, both the red and blue emissions will increase simultaneously with increasing codoped Cl − content. When the Cl − ion content is 0.06, the emission intensity of CaO: 0.01Eu 2+/3+ , 0.06Cl − reaches its maximum and its red and blue emission intensities increase by approximate 2.5 times and 13.2 times, respectively. The results show that CaO: Eu 2+/3+ , Cl − phosphors have potential application value in LEDs and anti-counterfeiting.

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Enhancement of luminescence and thermal stability in Sr_2.92-xTm_xSiO₅:Eu²⁺ for white LEDs

Cited by 3 publications

References 21 publications

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

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

Application of dual-layer phosphor geometries for enhancing the optical properties of white-light LEDs

Tunable Optical Properties, Enhanced Photoluminescence, and Thermostability of CaO: Eu^2+/3+ Phosphors by Codoping Cl^– Ions

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Enhancement of luminescence and thermal stability in Sr2.92-xTmxSiO5:Eu2+ for white LEDs

Cited by 3 publications

References 21 publications

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

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

Application of dual-layer phosphor geometries for enhancing the optical properties of white-light LEDs

Tunable Optical Properties, Enhanced Photoluminescence, and Thermostability of CaO: Eu2+/3+ Phosphors by Codoping Cl– Ions

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Product

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Enhancement of luminescence and thermal stability in Sr_2.92-xTm_xSiO₅:Eu²⁺ for white LEDs

Tunable Optical Properties, Enhanced Photoluminescence, and Thermostability of CaO: Eu^2+/3+ Phosphors by Codoping Cl^– Ions