An efficient green-emitting Ba5Si2O6Cl6:Eu2+ phosphor for white-light LED application

Dutta, Somrita; Chen, Teng‐Ming

doi:10.1039/c7ra07221j

Cited by 22 publications

(7 citation statements)

References 56 publications

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“…Dutta et al also reported the activation energy of Ba 5 Si 2 O 6 Cl 6 : Eu 2+ phosphors with high thermal stability was around 0.37 eV. In the present case, the high activation energy compared with the above reports was obtained, thereby indicating high thermal stability of the present phosphors …”

Section: Resultssupporting

confidence: 71%

“…In the present case, the high activation energy compared with the above reports was obtained, thereby indicating high thermal stability of the present phosphors. 16,19 Figure 4B presents the electroluminescence (EL) spectra of LEDs driven at a current of 280 mA. When Sr 1.906 Ce 0.06 Eu 0.004 Si 5 N 8 was coated on a blue LED chip, the EL spectrum exhibited near white light emission (0.34, 0.34) with the CCT value of 4964 K and R a of 80.…”

Section: Resultsmentioning

confidence: 99%

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Facile synthesis and spectroscopic characterization of siliconitride phosphors for white light‐emitting diodes

Yang

Som

et al. 2018

J Am Ceram Soc

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A modified chemical vapor deposition (CVD) technique is used to synthesize the color‐tunable siliconitride Sr2‐1.5x‐yCexEuySi5N8 (x = 0.000‐0.016 and y = 0.000‐0.020) phosphors. In comparison with the conventional solid‐state method, the CVD approach successfully improved the crystallinity, particle size distribution, and photoluminescence through the enhanced gas‐solid reaction. Under blue excitation, Sr1.98Eu0.02Si5N8 exhibited a red emission band at 618 nm. The incorporation of Ce3+ ions increased the emission intensity of Eu2+ ions by approximately 10% owing to the enhanced absorption and dipole‐dipole energy transfer process from Ce3+ to Eu2+ ions. It resulted in a shift of the emission colors from yellow to red region. The external and internal quantum efficiencies of Sr1.906Ce0.06Eu0.004Si5N8 were calculated as 54% and 70%, respectively. The activation energy of thermal stability for Sr1.906Ce0.06Eu0.004Si5N8 was evaluated as 0.31 eV. A white LED with a color rendering index of 80 and a CCT of 4964 K was successfully fabricated with the present phosphors. The current research demonstrated a new series of Sr2Si5N8:Ce3+, Eu2+ phosphors with color‐tunability for fabricating white LEDs with high color‐rendering index.

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Section: Resultssupporting

confidence: 71%

Section: Resultsmentioning

confidence: 99%

Facile synthesis and spectroscopic characterization of siliconitride phosphors for white light‐emitting diodes

Yang

Som

et al. 2018

J Am Ceram Soc

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“…White light emitting diodes (wLEDs) have been widely used in daily life due to their eco‐friendly properties, easy fabrication, high efficiency, low cost, and long luminescent lifetime . The traditional wLEDs are prepared by combining a blue LED chip with yellow‐emitting Y 3 Al 5 O 12 : Ce 3+ (YAG: Ce 3+ ) phosphors . Another approach for producing wLEDs is via combining red‐, green‐, and blue‐emitting phosphors with a near ultraviolet (NUV) LED chip .…”

Section: Introductionmentioning

confidence: 99%

Effects of the deep traps on the thermal‐stability property of CaAl₂O₄: Eu²⁺ phosphor

et al. 2018

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The thermal quenching properties and mechanisms of phosphors employed in white light emitting diodes (wLEDs) are critical for their commercial application. Here, we attempted to characterize the deep traps for capturing and releasing carriers to improve the thermal stability of the blue-emitting CaAl 2 O 4 : Eu 2+ , Tm 3+ phosphors. The enhanced thermal stability contributed to the introduction of traps has been demonstrated, and the mechanism of the transport process of carriers, has been explored in detail. In comparison with Eu 2+ doped sample, the co-doped Tm 3+ samples bring more deep traps. The releasing of carriers in deep traps therefore sustains the luminescence with increasing temperature and compensates the thermal luminescence intensity loss. The results provide a theoretical basis and new field of view for exploring excellent thermal stability phosphors for wLEDs.

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“…The halide ion could strongly coordinate with activator ions and therefore enhance the crystal‐field splitting (CFS) of Eu 2+ ions. Dutta and Chen synthesized green‐emitting Ba 5 Si 2 O 6 Cl 6 :Eu 2+ (BSOC:Eu 2+ ) phosphors . The luminescence studies revealed that increasing the concentration of Eu 2+ ion brought changes in the lattice parameters of the Ba 5 Si 2 O 6 Cl 6 that increased CFS, as shown in Figure .…”

Section: Development Of New Phosphorsmentioning

confidence: 83%

Tunable lanthanide/transition metal ion‐doped novel phosphors for possible application in w‐LEDs: a review

Tiwari

Dhoble

2019

Luminescence

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Lanthanide-based phosphors have been extensively investigated for their possible applications in solid-state lighting technologies especially for white-light-emitting diodes. In this review article emphasis has been laid on discussing the recent developments of phosphors for warm white-light production based on various optical characteristics such as quantum efficiency, thermal stability, short emission decay time, long-term stability, facile synthesis, and low cost of production. We have tried to cover the essential and latest discoveries of the lanthanide/rare earth-doped phosphors after 2010. New generations of narrow-band phosphors have also been included. The optical and material properties of several novel phosphors and their luminescence characteristics have been thoroughly discussed.

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An efficient green-emitting Ba₅Si₂O₆Cl₆:Eu²⁺ phosphor for white-light LED application

Abstract: The present paper reports a new phosphor material for WLED application with high CRI, low CCT and high colour stability.

Cited by 22 publications

References 56 publications

Facile synthesis and spectroscopic characterization of siliconitride phosphors for white light‐emitting diodes

Facile synthesis and spectroscopic characterization of siliconitride phosphors for white light‐emitting diodes

Effects of the deep traps on the thermal‐stability property of CaAl₂O₄: Eu²⁺ phosphor

Tunable lanthanide/transition metal ion‐doped novel phosphors for possible application in w‐LEDs: a review

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An efficient green-emitting Ba5Si2O6Cl6:Eu2+ phosphor for white-light LED application

Abstract: The present paper reports a new phosphor material for WLED application with high CRI, low CCT and high colour stability.

Cited by 22 publications

References 56 publications

Facile synthesis and spectroscopic characterization of siliconitride phosphors for white light‐emitting diodes

Facile synthesis and spectroscopic characterization of siliconitride phosphors for white light‐emitting diodes

Effects of the deep traps on the thermal‐stability property of CaAl2O4: Eu2+ phosphor

Tunable lanthanide/transition metal ion‐doped novel phosphors for possible application in w‐LEDs: a review

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An efficient green-emitting Ba₅Si₂O₆Cl₆:Eu²⁺ phosphor for white-light LED application

Effects of the deep traps on the thermal‐stability property of CaAl₂O₄: Eu²⁺ phosphor