Achievement of narrow-band blue-emitting phosphors KScSr1−yCaySi2O7:Bi3+ by the migration of luminescence centers

Yao, Yao; Wang, Zhijun; Cao, Lingwei; Zheng, Mingjie; Wang, Xuejiao; Zhang, Mengya; Cui, Jia; Yang, Zhibin; Ding, Wenge; Li, Panlai

doi:10.1039/d1ra01375k

Cited by 14 publications

(4 citation statements)

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“…The crystal field environment around Bi 3+ can be changed to achieve regulation of the luminous performance of Bi 3+ ‐doped phosphors, as Bi 3+ ions are particularly sensitive to different coordination environments. [ 15 ] The arrangement of groups of atoms followed by available information confirmed that the reported phosphor consisted of a monoclinic crystal structure symmetry. The crystallographic data and lattice parameter of Ca 2 BO 3 Cl phosphor are shown in Table 2.…”

Section: Resultsmentioning

confidence: 62%

“…In general, Bi 3+ ions are very sensitive to different coordination environments as well as crystal field environments around Bi 3+ that can be changed to achieve regulation of the luminescence performance of Bi 3+ ‐doped phosphors. [ 15 ] It is believed that doping with Bi 2+ or Bi 3+ ions with coordination numbers (CN) greater than or equal to 6 is the most useful. [ 25 ] According to the rule of ion radius matching, Bi 3+ ions were expected to occupy the positions of the Ca 2+ ions in the host matrix.…”

Section: Resultsmentioning

confidence: 99%

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Synthesis and novel emission properties of Bi³⁺‐doped Ca₂BO₃Cl phosphor for plant cultivation

et al. 2022

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In the present work, a series of Bi 3+ -activated Ca 2 BO 3 Cl phosphors was synthesized using the conventional high-temperature solid-state reaction method. The crystal structure of the prepared sample was determined to be monoclinic with space group P21/c. Scanning electron microscopy (SEM) analysis demonstrated the surface morphology with aggregated particles and sizes in the nano range.The presence of vibrational features and their luminescence characteristics were studied using Fourier transform infrared spectroscopy and photoluminescence (PL) techniques, respectively. At the 486 nm excitation wavelength, the PL spectrum revealed a sharp emission centred at 732 nm that was attributed to the 3 P 1 ! 1 S 0 transition of Bi 3+ . The emission spectra exhibited the highest emission intensity at 0.5 mol% Bi 3+ ion concentration, beyond this the emission intensity decreased due to the concentration quenching phenomenon attributed to multipolar interaction. The Commission Internationale de l'éclairage coordinates located at (0.7347, 0.2653) confirmed emission in the deep-red region with a colour purity of 99.98%. The obtained outcomes suggested that the reported material may be a promising candidate as a red-emitting phosphor for w-LEDs and plant growth applications.

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Section: Resultsmentioning

confidence: 62%

Section: Resultsmentioning

confidence: 99%

Synthesis and novel emission properties of Bi³⁺‐doped Ca₂BO₃Cl phosphor for plant cultivation

et al. 2022

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“…Our previous results have shown that the optimal doping concentration of Bi 3+ in KScSrSi 2 O 7 : x Bi 3+ is x = 0.07; 28 therefore, in this work, KScSrSi 2 O 7 :0.07Bi 3+ was selected as the research object. In order to explore the effect of cation substitution on luminescence, a series of KScSrSi 2− y Ge y O 7 :0.07Bi 3+ (0 < y < 0.7) phosphors were prepared.…”

Section: Resultsmentioning

confidence: 99%

A novel cyan-emitting phosphor KScSrSi_2−yGe_yO₇:0.07Bi³⁺ for white LEDs with high color rendering index and low correlated color temperature

et al. 2022

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“…Recent research in red phosphor materials has helped the production of white-emitting LEDs with CCT values reaching as high as 5000 K (daylight) [8]. Still, these WLEDs exhibit LER below commercial standards because most of the commonly used red phosphors emit around ∼800 nm, which the human eye cannot quite perceive [10].…”

Section: Introductionmentioning

confidence: 99%

CsPbI₃/N-GQDs dual layer phosphor-converted white-LEDs with ultrahigh luminous efficiency and color rendering index

Dey¹,

Ghorai²,

Das³

et al. 2022

Nanotechnology

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Phosphor-converted LEDs or pc-LEDs, as a solid-state lighting source, are attractive for next-generation display technologies because of their energy savings, and green environmentally friendly nature. Recently, white LEDs are being produced commercially by coating blue LED (440-470 nm) chips with various yellow-emitting phosphors. However, the LEDs produced by this technique often exhibit high correlated color temperature (CCT) and low color rendering index (CRI) values, due to sufficient red spectral components not being present, and thus aren’t suitable for commercial grade white illumination. To circumvent this drawback, our work reports for the first time the use of blue and green-emitting nitrogen-functionalized GQDs coupled with red-emitting CsPbI3 NCs for phosphor based LED applications. We deployed near-UV to visible excitable red-emitting perovskite CsPbI3 nanocrystals which contribute toward the red spectral component, thus greatly improving the CRI of the LEDs. CsPbI3 nanocrystals are optically excited by nitrogen functionalized graphene quantum dots (GQDs) with blue and green emissions in a remote double-layer phosphor stack technique. This double phosphor layer stacking greatly improves both the color rendering index (CRI) and luminous efficiency of radiation (LER), which usually has a trade-off in previously reported phosphor stacks. A correlated color temperature of ~5182 K providing daylight white tonality, with superior color rendering index (~90%) and ultrahigh luminous efficiency of radiation(~250 lumens/watt) are reported, which are significantly higher than the established benchmarks.

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Achievement of narrow-band blue-emitting phosphors KScSr_1−yCa_ySi₂O₇:Bi³⁺ by the migration of luminescence centers

Abstract: Narrow-band blue emitting phosphor KScSr1−yCaySi2O7:0.07Bi3+ with FWHM 40 nm.

Cited by 14 publications

References 50 publications

Synthesis and novel emission properties of Bi³⁺‐doped Ca₂BO₃Cl phosphor for plant cultivation

Synthesis and novel emission properties of Bi³⁺‐doped Ca₂BO₃Cl phosphor for plant cultivation

A novel cyan-emitting phosphor KScSrSi_2−yGe_yO₇:0.07Bi³⁺ for white LEDs with high color rendering index and low correlated color temperature

CsPbI₃/N-GQDs dual layer phosphor-converted white-LEDs with ultrahigh luminous efficiency and color rendering index

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Achievement of narrow-band blue-emitting phosphors KScSr1−yCaySi2O7:Bi3+ by the migration of luminescence centers

Abstract: Narrow-band blue emitting phosphor KScSr1−yCaySi2O7:0.07Bi3+ with FWHM 40 nm.

Cited by 14 publications

References 50 publications

Synthesis and novel emission properties of Bi3+‐doped Ca2BO3Cl phosphor for plant cultivation

Synthesis and novel emission properties of Bi3+‐doped Ca2BO3Cl phosphor for plant cultivation

A novel cyan-emitting phosphor KScSrSi2−yGeyO7:0.07Bi3+ for white LEDs with high color rendering index and low correlated color temperature

CsPbI3/N-GQDs dual layer phosphor-converted white-LEDs with ultrahigh luminous efficiency and color rendering index

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Product

Resources

About

Achievement of narrow-band blue-emitting phosphors KScSr_1−yCa_ySi₂O₇:Bi³⁺ by the migration of luminescence centers

Synthesis and novel emission properties of Bi³⁺‐doped Ca₂BO₃Cl phosphor for plant cultivation

Synthesis and novel emission properties of Bi³⁺‐doped Ca₂BO₃Cl phosphor for plant cultivation

A novel cyan-emitting phosphor KScSrSi_2−yGe_yO₇:0.07Bi³⁺ for white LEDs with high color rendering index and low correlated color temperature

CsPbI₃/N-GQDs dual layer phosphor-converted white-LEDs with ultrahigh luminous efficiency and color rendering index