Enhanced luminous efficiency of deep red emitting K2SiF6:Mn4+ phosphor dependent on KF ratio for warm-white LED

Lee, M.J.; Song, Y.H.; Song, Young-Hyun; Han, Gill Sang; Jung, Hyun Suk; Yoon, Dae Ho

doi:10.1016/j.matlet.2014.11.025

Cited by 51 publications

(12 citation statements)

References 20 publications

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“…Both a narrow band and a line-shaped red emission have been major requirements in light emitting diode (LED) applications such as displays and lighting as the demand for a more extensive color gamut and better renditions has increased. [1][2][3][4][5][6][7] Although a narrow band type of red emission has been realized in several of Eu 2+ -activated systems, 8,9 line-shaped red emissions are more desirable in the industry. With this regard, Mn 4+ -activated phosphors have attracted more attention than Eu 2+ , Eu 3+ , and Pr 3+ activated systems as it is the only activator with an acceptable level of absorption in the blue light excitation wavelength range, which coincides with the current LED chip's emission wavelength range.…”

Section: Introductionmentioning

confidence: 99%

“…Both a narrow band and a line‐shaped red emission have been major requirements in light emitting diode (LED) applications such as displays and lighting as the demand for a more extensive color gamut and better renditions has increased . Although a narrow band type of red emission has been realized in several of Eu 2+ ‐activated systems, line‐shaped red emissions are more desirable in the industry.…”

Section: Introductionmentioning

confidence: 99%

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A novel Mn⁴⁺‐activated red phosphor for use in light emitting diodes, K₃SiF₇:Mn⁴⁺

et al. 2016

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Phosphors that exhibit a narrow red emission are particularly interesting due to the advantage of providing a more extensive color gamut and better rendering in LED applications such as displays and solid‐state lighting. Although some Eu2+‐activated nitridosilicates have been discovered in this regard, K2SiF6:Mn4+ phosphors are the only option in actual LED applications thus far. We discovered a novel phosphor, K3SiF7:Mn4+, with P4/mbm symmetry. The luminescent properties of K3SiF7:Mn4+ are almost identical to those of the K2SiF6:Mn4+ phosphor, but its materials identity is distinct due to a completely different crystallographic structure, which leads to reduced decay time. The fast decay is one of the most serious disadvantages of existing K2SiF6:Mn4+ phosphors. The K3SiF7:Mn4+ phosphor was examined in comparison to the K2SiF6:Mn4+ via density functional theory calculation, Rietveld refinement, X‐ray photoelectron spectroscopy, X‐ray absorption near‐edge structure spectroscopy, and time‐resolved photoluminescence.

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Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

A novel Mn⁴⁺‐activated red phosphor for use in light emitting diodes, K₃SiF₇:Mn⁴⁺

et al. 2016

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“…H 2 O 2 and glycine are added to enhance the reaction rate and improve reaction homogeneity, respectively. Notably, Mn 7+ can be reduced to Mn 2+ by adding excess H 2 O 2 .…”

Section: Resultsmentioning

confidence: 99%

Co‐precipitation synthesis and luminescence properties of K₂TiF₆:Mn⁴⁺ red phosphors for warm white light‐emitting diodes

et al. 2015

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K2TiF6:Mn(4+) red phosphors with different Mn(4+) doping concentrations were obtained using the co-precipitation method. X-Ray diffraction, scanning electron microscopy, Raman spectra, Fourier transform infrared spectroscopy, photoluminescence excitation and emission spectra and decay curves were used to characterize the properties of K2TiF6:Mn(4+) phosphors. Under excitation at 470 nm, an intense red emission peak around 631 nm corresponding to the (2)E(g)-(4)A2 transition of Mn(4+) was observed for 2.48 mol% K2TiF6:Mn(4+) phosphors and was used as the optimum doping concentration. The excellent luminescent properties of K2TiF6:Mn(4+) suggest that this material might be a promising red phosphor for generating warm white light in phosphor-converted white light-emitting diodes.

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“…Efficient narrow-band redemitting phosphors such as 4 26 K SiF : Mn + (KSF), with an emission peak at 631 nm, were developed to replace wide band nitride red phosphor. Many studies had been conducted to optimize the environmental stability, quantum efficiency, and synthesis of KSF [46][47][48].…”

Section: Potassium Fluorosilicate (Ksf)mentioning

confidence: 99%

Blue Laser Diode-Based Visible Light Communication and Solid-State Lighting

Ali¹,

Li²,

Fu³

et al. 2022

Antenna Systems

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In this chapter, we review our recent work on blue laser diode-based visible light communication and solid-state lighting. Gallium nitride (GaN) phosphor-converted white light-emitting diodes (Pc-WLEDs) are emerging as an indispensable solid-state lighting (SSL) source for next-generation display system and the lighting industry. Together with the function of lighting, visible light communication (VLC) using Pc-WLEDs has gained increasing attention to fulfill the growing demand for wireless data communication. Practically, the low modulation response and low emitting intensity of light-emitting diodes (LED) are the drawbacks for the development of ultrahigh-speed VLC and high-quality SSL system. Blue GaN laser diode (LD) and remote phosphor-based white light can be used for both high-speed VLC and SSL simultaneously. We demonstrated a color-rendering index (CRI) of 93.8, a correlated color temperature (CCT) of 4435 K, and a data rate of 1.6 Gbps under NRZ-OOK modulation by an exciting blue laser diode on narrowband green−/red-emitting composite phosphor film. This work opens up exciting possibilities for future high-speed indoor VLC and high-quality SSL.

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Enhanced luminous efficiency of deep red emitting K2SiF6:Mn4+ phosphor dependent on KF ratio for warm-white LED

Cited by 51 publications

References 20 publications

A novel Mn⁴⁺‐activated red phosphor for use in light emitting diodes, K₃SiF₇:Mn⁴⁺

A novel Mn⁴⁺‐activated red phosphor for use in light emitting diodes, K₃SiF₇:Mn⁴⁺

Co‐precipitation synthesis and luminescence properties of K₂TiF₆:Mn⁴⁺ red phosphors for warm white light‐emitting diodes

Blue Laser Diode-Based Visible Light Communication and Solid-State Lighting

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Enhanced luminous efficiency of deep red emitting K2SiF6:Mn4+ phosphor dependent on KF ratio for warm-white LED

Cited by 51 publications

References 20 publications

A novel Mn4+‐activated red phosphor for use in light emitting diodes, K3SiF7:Mn4+

A novel Mn4+‐activated red phosphor for use in light emitting diodes, K3SiF7:Mn4+

Co‐precipitation synthesis and luminescence properties of K2TiF6:Mn4+ red phosphors for warm white light‐emitting diodes

Blue Laser Diode-Based Visible Light Communication and Solid-State Lighting

Contact Info

Product

Resources

About

A novel Mn⁴⁺‐activated red phosphor for use in light emitting diodes, K₃SiF₇:Mn⁴⁺

A novel Mn⁴⁺‐activated red phosphor for use in light emitting diodes, K₃SiF₇:Mn⁴⁺

Co‐precipitation synthesis and luminescence properties of K₂TiF₆:Mn⁴⁺ red phosphors for warm white light‐emitting diodes