Dye-embedded YAG:Ce<sup>3+</sup>@SiO<sub>2</sub>composite phosphors toward warm wLEDs through radiative energy transfer: preparation, characterization and luminescence properties

Pan, Guohui; Wu, Huajun; He, Shuai; Zhang, Liangliang; Hao, Zhendong; Zhang, Xia; Zhang, Jiahua

doi:10.1039/c8nr07360k

Cited by 26 publications

(8 citation statements)

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“…Figure 11a also depicts that the higher the thickness of YAG:Ce shell, the higher is the maximum intensity in the PL spectrum. As can be seen, SiO 2 @YAG:Ce (1.0 at.% Ce) nanoparticles show the highest emission, compared to commercial and synthesized SiO 2 /YAG:Ce mixture composite, that is in agreement with similar works in this field [20][21][22][48][49][50][51]. The increased PL intensity of YAG:Ce in the core-shell state is believed to result from the inhibition of surface states in YAG:Ce nanoparticles and the higher light extraction at the SiO 2 /YAG:Ce interface.…”

Section: Photoluminescence (Pl) and Diffuse Transmission Spectra (Dtssupporting

confidence: 90%

Towards Multi-Functional SiO2@YAG:Ce Core–Shell Optical Nanoparticles for Solid State Lighting Applications

et al. 2020

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This paper aims to investigate the synthesis, structure, and optical properties of SiO2@YAG:Ce core–shell optical nanoparticles for solid state lighting applications. YAG:Ce phosphor is a key part in white light emitting diodes (LEDs), with its main functionality being the generation of yellow light. Generated yellow light from phosphor will be combined with blue light, emitted from chip, resulting in the generation of white light. Generated light in LEDs will often be scattered by SiO2 nanoparticles. SiO2 nanoparticles are often distributed within the optical window, aiming for a more homogeneous light output. The main idea in this research is to combine these functionalities in one core–shell particle, with its core being SiO2 and its shell being phosphor. In this study core–shell nanoparticles with different Ce3+ concentrations were synthesized by a sol–gel method. Synthesized nanoparticles were characterized by X-ray diffraction (XRD), small angle X-ray scattering (SAXS) analysis, high resolution transmission electron macroscopy (HRTEM), Fourier transform infrared (FTIR), and photoluminescence spectroscopy. Luminescence characteristics of SiO2@YAG:Ce core–shell particles were compared with that of SiO2/YAG:Ce mixture composite, which is now used in commercial LEDs. Obtained results showed that core–shell nanoparticles have comparatively much better optical properties, compared to SiO2/YAG:Ce mixture composite and can therefore be potentially used in LEDs.

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Section: Photoluminescence (Pl) and Diffuse Transmission Spectra (Dtssupporting

confidence: 90%

Towards Multi-Functional SiO2@YAG:Ce Core–Shell Optical Nanoparticles for Solid State Lighting Applications

et al. 2020

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“…[1][2][3] Nowadays,ablue chip (InGaN) coated with yellow phosphors (YAG :Ce 3+ )iswidely used to produce the commercial wLEDs. [4,5] However,such design has adrawback:the emission of blue light originating from the blue chip is much more intense than the one of yellow light originating from phosphors. [6,7] Artificial blue-rich white light has been reported to have negative effects on sleep-wake cycles,eating patterns,m etabolism, and mental alertness,a st he photo-sensitive ganglion cells in the retina signal the brain to stop producing melatonin.…”

Section: Introductionmentioning

confidence: 99%

Doped Lead Halide White Phosphors for Very High Efficiency and Ultra‐High Color Rendering

et al. 2020

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Near-UV-pumped white-light-emitting diodes with ultra-high color rendering and decreased blue-light emission is highly desirable.H owever,d iscovering as ingle-phase white light emitter with such characteristics remains challenging. Herein, we demonstrate that Mn doping as lowa s0 .027 %i n the hybrid post-perovskite type (TDMP)PbBr 4 (TDMP = trans-2,5-dimethylpiperaziniium) enables to achieve ab right pure white emission replicating the spectrum of the sunsrays. Thus,awhite phosphor exhibiting an emission with CIE coordinates (0.330, 0.365), ahigh photoluminescence quantum yield of 60 %( new recordf or white light emission of hybrid lead halides), and an ultra-high color rendering index (CRI = 96, R9 = 91.8), corresponding to the recordv alue for as ingle phase emitter was obtained. The investigation of the photoluminescence properties revealed how free excitons,s elftrapped excitons,and lowamount of Mn dopants are coupled to give rise to such pure white emission.Supportinginformation and the ORCID identification number(s) for the author(s) of this article can be found under: https://doi.

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“…White light‐emitting diodes (wLEDs), which are regarded as the next‐generation lighting sources, have been commonly used in diverse applications such as daily lighting, computers, and mobile phones . Nowadays, a blue chip (InGaN) coated with yellow phosphors (YAG: Ce 3+ ) is widely used to produce the commercial wLEDs . However, such design has a drawback: the emission of blue light originating from the blue chip is much more intense than the one of yellow light originating from phosphors .…”

Section: Introductionmentioning

confidence: 99%

Doped Lead Halide White Phosphors for Very High Efficiency and Ultra‐High Color Rendering

et al. 2020

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Near‐UV‐pumped white‐light‐emitting diodes with ultra‐high color rendering and decreased blue‐light emission is highly desirable. However, discovering a single‐phase white light emitter with such characteristics remains challenging. Herein, we demonstrate that Mn doping as low as 0.027 % in the hybrid post‐perovskite type (TDMP)PbBr4 (TDMP=trans‐2,5‐dimethylpiperaziniium) enables to achieve a bright pure white emission replicating the spectrum of the sun's rays. Thus, a white phosphor exhibiting an emission with CIE coordinates (0.330, 0.365), a high photoluminescence quantum yield of 60 % (new record for white light emission of hybrid lead halides), and an ultra‐high color rendering index (CRI=96, R9=91.8), corresponding to the record value for a single phase emitter was obtained. The investigation of the photoluminescence properties revealed how free excitons, self‐trapped excitons, and low amount of Mn dopants are coupled to give rise to such pure white emission.

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Dye-embedded YAG:Ce³⁺@SiO₂composite phosphors toward warm wLEDs through radiative energy transfer: preparation, characterization and luminescence properties

Abstract: Surface SiO2 coating and simultaneous dye embedding in micro/nano-YAG:Ce3+ phosphors toward Ce3+ spectral profile tailoring through radiative energy transfer is demonstrated.

Cited by 26 publications

References 50 publications

Towards Multi-Functional SiO2@YAG:Ce Core–Shell Optical Nanoparticles for Solid State Lighting Applications

Towards Multi-Functional SiO2@YAG:Ce Core–Shell Optical Nanoparticles for Solid State Lighting Applications

Doped Lead Halide White Phosphors for Very High Efficiency and Ultra‐High Color Rendering

Doped Lead Halide White Phosphors for Very High Efficiency and Ultra‐High Color Rendering

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Dye-embedded YAG:Ce3+@SiO2composite phosphors toward warm wLEDs through radiative energy transfer: preparation, characterization and luminescence properties

Abstract: Surface SiO2 coating and simultaneous dye embedding in micro/nano-YAG:Ce3+ phosphors toward Ce3+ spectral profile tailoring through radiative energy transfer is demonstrated.

Cited by 26 publications

References 50 publications

Towards Multi-Functional SiO2@YAG:Ce Core–Shell Optical Nanoparticles for Solid State Lighting Applications

Towards Multi-Functional SiO2@YAG:Ce Core–Shell Optical Nanoparticles for Solid State Lighting Applications

Doped Lead Halide White Phosphors for Very High Efficiency and Ultra‐High Color Rendering

Doped Lead Halide White Phosphors for Very High Efficiency and Ultra‐High Color Rendering

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Dye-embedded YAG:Ce³⁺@SiO₂composite phosphors toward warm wLEDs through radiative energy transfer: preparation, characterization and luminescence properties