Luminescence and energy transfer properties of color-tunable Sr4La(PO4)3O: Ce3+, Tb3+, Mn2+ phosphors for WLEDs

Ju, Cheng; Zhang, Jia; Lü, Jian; Zhang, Hongchao; Sardar, Maryam; Shen, Zhonghua; Ni, Xiaowu; Bian, Xintian; Ma, Peng‐Cheng; Jin, Shi

doi:10.1364/ome.8.001850

Cited by 20 publications

(16 citation statements)

References 43 publications

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“…The degradation in lumen efficiency can be explained by the scattering effects of (Y,Gd)BO3:Eu phosphors via Mie-theory. Mie-scattering theory [24], [25] was also a useful mean in computing scattering cross section Csca for phosphor particles with the spherical shape. In addition to that, Lambert-Beer law was utilized to compute the power of transmitted lights:…”

Section: Resultsmentioning

confidence: 99%

(Y,Gd)BO3:Eu red phosphor for dual-layer phosphor structure to enhance the optical performance of white light-emitting diodes

Tien

2021

Bulletin EEI

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Among the structures using for fabricating white light-emitting diodes (WLEDs) such as the conformal coating or in-cup geometries, the remote phosphor structure gives the highest luminous efficacy. However, in terms of color quality, its performance is not as good as the others. The red-light compensation has been reported as the effective solution for enhancing the color quality of WLEDs. Hence, this study adopted the idea and applied to the dual-layer phosphor structure. The phosphor used to boost the red color in light formation is (Y,Gd)BO3:Eu particle. The dual-layer remote phosphor structure was simulated with the red (Y,Gd)BO3:Eu phosphor layer above the original yellow phosphor YAG:Ce3+ one. The WLEDs with different correlated color temperatures of 5600 K, 6600 K and 7700K were experimented. Mie-theory and Lambert-Beer law were applied to examine the results. The growth in color rendering index (CRI) and color quality scale (CQS) with the increase of (Y,Gd)BO3:Eu phosphor concentration was observed. Nevertheless, the lumen efficacy would be degraded if the concentration was over a certain number. The information provided in this article is useful for the development of high-power WLED production with greater color quality.

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Section: Resultsmentioning

confidence: 99%

(Y,Gd)BO3:Eu red phosphor for dual-layer phosphor structure to enhance the optical performance of white light-emitting diodes

Tien

2021

Bulletin EEI

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“…Besides, the fluorescence of the phosphor samples was investigated with a photomultiplier perpendicular to the stimulation illumination. We detect the colour coordinates of the phosphor with the colour analyzer equipped with a detector (CCD) [16]. The measurements of colour rendering index and luminescence efficacy of the phosphor specimens were made at normal temperature, and attained with an EVERFINE integrating sphere.…”

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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“…The rare earth (RE) in composition with nanophosphors can demonstrate acute inception and radiation spectra in UV-Vis region with great amount efficiency, extended working duration, stable chemical composition, heat, and light display, environment friendly and minimal waste. In recent studies, the quantum yield of Sr4Al14O25 [13]; Ca14Al10Zn6O35 [14]; CaAl12O19 [15]; Sr4Al14-O25:Mn 4+ [16] is estimated to be 38%, 50%, 35.5%, 60.8% under 450 nm blue light excitation, and 166% respectively [17];. The trivalent luminous lanthanide (Ln 3+ ) ions, which have a comparable ion radius to composite particles, are reasonably easy to mix to the particle configuration and provide good lighting performance even at ambient temperature [18]- [21].…”

Section: Introductionmentioning

confidence: 99%

Enhancing optical properties of WLEDs with LaOF:Eu3+&SiO2 application

Huu

Thi

2022

Bulletin EEI

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After many efforts, the core-shell nanostructure of LaOF:Eu3+SiO2 that emits bright red radiation can be fabricated by simple solvothermal application succeeded by heat treatment. The resulted particles from the fabrication process are small in size, able to demonstrate circular form more efficient and prevent stacking. Photoluminescence (PL) emission spectra exhibits intense peaks at 593 nm, 611 nm, 650 nm corresponds to 5D0 -- 7FJ (J = 0, 1 and 2) Eu3+ transitions respectively. The spectral intensity parameters and Eu-O ligand behaviors are estimated by means of Judd-Ofelt (J-O) theory. CIE co-ordinates are found to be (x = 0.63, y = 0.36) which is very close to standard NTSC values (x = 0.67, y = 0.33). CCT value is 3475 K which is less than 5000 K, as a result this phosphor is suitable for warm light emitting diodes. The optimized core-shell SiO2 (coat III)@LaOF:Eu3+ (5 mol%) was used as a fluorescent labeling marker to identity latent fingerprints on both porous and non-porous surfaces. The fingerprints results are highly sensitive, selective and also has no obstruction caused by the back-ground which supports level-I to level-III fingerprint ridge recognition. The experiments outcomes suggest that the enhancements brought by the core-shell NS structure can be further examined to apply in forensic and solid state lightning applications.

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Luminescence and energy transfer properties of color-tunable Sr₄La(PO₄)₃O: Ce³⁺, Tb³⁺, Mn²⁺ phosphors for WLEDs

Cited by 20 publications

References 43 publications

(Y,Gd)BO<sub>3</sub>:Eu red phosphor for dual-layer phosphor structure to enhance the optical performance of white light-emitting diodes

(Y,Gd)BO<sub>3</sub>:Eu red phosphor for dual-layer phosphor structure to enhance the optical performance of white light-emitting diodes

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

Enhancing optical properties of WLEDs with LaOF:Eu3+&SiO2 application

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