Red phosphor converts white LEDs

Huang, Xiaoyong

doi:10.1038/nphoton.2014.221

Cited by 416 publications

(114 citation statements)

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“…The decay curves were well fitted to single exponential functions, and the decay time values were estimated to be 6.59, 6.90 and 6.50 μs for the CKZV1, CKZV2 and CKZV3 samples, respectively. The short decay time of phosphor material avoids saturation at high excitation flux4748. So, the short decay time of CKZV samples makes them more suitable as materials for WLEDs.…”

Section: Resultsmentioning

confidence: 99%

Rare-earth free self-luminescent Ca2KZn2(VO4)3 phosphors for intense white light-emitting diodes

Bharat

Jeon²,

Krishna

et al. 2017

Sci Rep

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The commercially available white-light-emitting diodes (WLEDs) are made with a combination of blue LEDs and yellow phosphors. These types of WLEDs lack certain properties which make them meagerly applicable for general illumination and flat panel displays. The solution for such problem is to use near-ultraviolet (NUV) chips as an excitation source because of their high excitation efficiency and good spectral distribution. Therefore, there is an active search for new phosphor materials which can be effectively excited within the NUV wavelength range (350–420 nm). In this work, novel rare-earth free self-luminescent Ca2KZn2(VO4)3 phosphors were synthesized by a citrate assisted sol-gel method at low calcination temperatures. Optical properties, internal quantum efficiency and thermal stability as well as morphology and crystal structure of Ca2KZn2(VO4)3 phosphors for their application to NUV-based WLEDs were studied. The crystal structure and phase formation were confirmed with XRD patterns and Rietveld refinement. The optical properties of these phosphor materials which can change the NUV excitation into visible yellow-green emissions were studied. The synthesized phosphors were then coated onto the surface of a NUV chip along with a blue phosphor (LiCaPO4:Eu2+) to get brighter WLEDs with a color rendering index of 94.8 and a correlated color temperature of 8549 K.

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Section: Resultsmentioning

confidence: 99%

Rare-earth free self-luminescent Ca2KZn2(VO4)3 phosphors for intense white light-emitting diodes

Bharat

Jeon²,

Krishna

et al. 2017

Sci Rep

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“…These materials are widely applied in light-emitting diodes, solar cells, sensing, catalysis, integration in photovoltaic devices, and more recently in biosensing, bioimaging, or medical diagnosis [1,2,3,4,5,6]. …”

Section: Introductionmentioning

confidence: 99%

Transparent Glass-Ceramics Produced by Sol-Gel: A Suitable Alternative for Photonic Materials

et al. 2018

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Transparent glass-ceramics have shown interesting optical properties for several photonic applications. In particular, compositions based on oxide glass matrices with fluoride crystals embedded inside, known as oxyfluoride glass-ceramics, have gained increasing interest in the last few decades. Melt-quenching is still the most used method to prepare these materials but sol-gel has been indicated as a suitable alternative. Many papers have been published since the end of the 1990s, when these materials were prepared by sol-gel for the first time, thus a review of the achievements obtained so far is necessary. In the first part of this paper, a review of transparent sol-gel glass-ceramics is made focusing mainly on oxyfluoride compositions. Many interesting optical results have been obtained but very little innovation of synthesis and processing is found with respect to pioneering papers published 20 years ago. In the second part we describe the improvements in synthesis and processing obtained by the authors during the last five years. The main achievements are the preparation of oxyfluoride glass-ceramics with a much higher fluoride crystal fraction, at least double that reported up to now, and the first synthesis of NaGdF4 glass-ceramics. Moreover, a new SiO2 precursor was introduced in the synthesis, allowing for a reduction in the treatment temperature and favoring hydroxyl group removal. Interesting optical properties demonstrated the incorporation of dopant ions in the fluoride crystals, thus obtaining crystal-like spectra along with higher efficiencies with respect to xerogels, and hence demonstrating that these materials are a suitable alternative for photonic applications.

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“…Such so-called phosphor-converted WLEDs are generally fabricated through three approaches: (1) combining a blue LED chip with a yellow phosphor (e.g., YAG:Ce 3+ ) or a blend of green and red phosphors, (2) combining an ultraviolet (UV) LED chip with a blend of tricolor (blue, green, and red) phosphors, and (3) combining an UV LED chip with a single-phased white-emitting phosphor. [11][12][13][14] Nowadays, the widely used WLEDs are fabricated by coating YAG:Ce 3+ yellow phosphors on InGaN blue LED chips, however these WLEDs commonly suffer from high correlated color temperature (CCT) and low color rendering index (CRI) owing to the lack of a red component, limiting their applications in indoor lighting. [15][16][17][18][19][20][21] On the other hand, the WLEDs made by multiple-emitting phosphors also have some drawbacks, such as intrinsic color balance, device complication and high cost.…”

Section: Introductionmentioning

confidence: 99%

Synthesis and photoluminescence properties of Eu³⁺-activated LiCa₃ZnV₃O₁₂white-emitting phosphors

Huang

Guo

2018

RSC Adv.

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Red phosphor converts white LEDs

Cited by 416 publications

References 11 publications

Rare-earth free self-luminescent Ca2KZn2(VO4)3 phosphors for intense white light-emitting diodes

Rare-earth free self-luminescent Ca2KZn2(VO4)3 phosphors for intense white light-emitting diodes

Transparent Glass-Ceramics Produced by Sol-Gel: A Suitable Alternative for Photonic Materials

Synthesis and photoluminescence properties of Eu³⁺-activated LiCa₃ZnV₃O₁₂white-emitting phosphors

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Red phosphor converts white LEDs

Cited by 416 publications

References 11 publications

Rare-earth free self-luminescent Ca2KZn2(VO4)3 phosphors for intense white light-emitting diodes

Rare-earth free self-luminescent Ca2KZn2(VO4)3 phosphors for intense white light-emitting diodes

Transparent Glass-Ceramics Produced by Sol-Gel: A Suitable Alternative for Photonic Materials

Synthesis and photoluminescence properties of Eu3+-activated LiCa3ZnV3O12white-emitting phosphors

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Synthesis and photoluminescence properties of Eu³⁺-activated LiCa₃ZnV₃O₁₂white-emitting phosphors