Preparation and characterization of SiO2-coated Sr4A114O25:Eu2+, Dy3+/light conversion agent yellow phosphor

Xue, Haolong; Zhu, Yanan; Ge, Mingqiao

doi:10.1007/s10854-017-6635-x

Cited by 5 publications

(3 citation statements)

References 12 publications

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“…The results showed that the composite film had good adhesion and emitted blue fluorescence due to the characteristic transition from the 4f 6 5d excited state to the 4f 7 ground state of the Eu 2+ ion in the main body of Sr 2 MgSi 2 O 7 . Xue et al [42] successfully prepared SiO 2 -coated Sr 4 Al 14 O 25 :Eu 2+ ,Dy 3+ -LCA composite yellow phosphor using the sol-gel method. The light conversion agent and SiO 2 were combined with strontium aluminate through Al-O-Si bonds and the silane coupling agent, respectively.…”

Section: Sol-gel Methodsmentioning

confidence: 99%

Research Progress of Light Wavelength Conversion Materials and Their Applications in Functional Agricultural Films

2022

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As new fluorescent materials, light wavelength conversion materials (light conversion agents) have attracted increasing attention from scientific researchers and agricultural materials companies due to their potential advantages in efficiently utilizing solar energy and increasing crop yield. According to the material properties, the light conversion agents can be divided into fluorescent dyes, organic rare-earth complexes, and inorganic rare-earth complexes. The current researches indicates that the fluorescent dyes have relatively high production costs, poor light stability, difficult degradation processes, and easily cause pollution to the ecological environment. The organic rare-earth complexes have short luminescence times, high production costs, and suffer from rapid decreases in luminescence intensity. Compared with fluorescent dyes and organic rare-earth complexes, although rare-earth inorganic complexes have high luminous efficiency, stable chemical properties, and better spectral matching performance, the existing inorganic light conversion agents have relatively poor dispersibility in agricultural films. According to the research on light conversion agents at home and abroad in recent years, this paper first introduces the three common light conversion agents, namely fluorescent dyes, organic rare-earth complexes, and inorganic rare-earth complexes, as well as their uses in agricultural films and their mechanisms of light conversion. At the same time, the preparation methods, advantages, disadvantages, and existing problems of various light conversion agents are classified and explained. Finally, we predict the development trends for light conversion agents in the future by considering six aspects, namely efficiency, cost, compatibility with greenhouse films, light matching, and light transmittance, in order to provide a reference for the preparation of stable and efficient light conversion agent materials.

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Section: Sol-gel Methodsmentioning

confidence: 99%

Research Progress of Light Wavelength Conversion Materials and Their Applications in Functional Agricultural Films

2022

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“…However, it cannot support high-quality WLEDs. Therefore, the conformal coating method can become a better choice because it is capable of distributing colors uniformly, resulting in angular homogeneity of correlated color temperature (CCT) [6]. Nevertheless, it cannot be completely perfect since the backscattering effect reduces luminous efficiency considerably.…”

Section: Introductionmentioning

confidence: 99%

The impacts of Ba₂Li₂Si₂O₇:Sn²⁺,Mn²⁺ and CaMgSi₂O₆:Eu²⁺,Mn²⁺ particles on the optical properties of remote phosphor LED

Chen¹,

Loan²,

Tho

et al. 2020

Materials Science-Poland

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As implied in the title, the triple-layer remote phosphor (TRP), constructed with the yellow YAG:Ce3+ layer at the bottom, the red CaMgSi2O6:Eu2+,Mn2+ phosphor layer on the top, and the green Ba2Li2Si2O7:Sn2+,Mn2+ phosphor layer between these two layers, is suggested in this paper to improve the color and luminescence of white LEDs (WLEDs). In order to control the red light for the purpose of increasing the color rendering index (CRI), it is suggested that the red CaMgSi2O6:Eu2+,Mn2+ phosphor should be applied in the TRP structure. Simultaneously, the structure uses the green Ba2Li2Si2O7:Sn2+,Mn2+ phosphor layer to control the green light, which increases the luminous efficacy (LE) of WLEDs. In addition, when the concentration of these two phosphors increases, the yellow YAG:Ce3+ concentration must be reduced to keep the average correlated color temperatures (ACCTs) stable at 6000 K to 8500 K. Besides, appropriate adjusting of CRI, LE, and color quality scale (CQS) is also analyzed by modifying the concentration of the green phosphor and red phosphor. The results show that the CRI can get better values if CaMgSi2O6:Eu2+,Mn2+ concentration is higher. In contrast, the CRI decreases dramatically when the concentration of Ba2Li2Si2O7:Sn2+,Mn2+ increases. Meanwhile, CQS can be significantly increased in the range of 10 % to 14 % CaMgSi2O6:Eu2+,Mn2+, regardless of the concentration of Ba2Li2Si2O7:Sn2+,Mn2+. In particular, along with the improvement of CRI and CQS, LE can also be increased by more than 40 % by reducing the scattered light and adding the green light. Obtained results are a valuable reference for manufacturers for improving WLEDs color and luminescence quality to produce a broader range of WLEDs with better quality fulfilling social needs.

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“…Owning to the rapid rise of market demands, luminous efficiency and color quality really need further breakthrough to expand their applications [5]. One of the most common methods for white light generation is the combination of yellow rays converted from the red phosphors and the blue rays from the LED chip [6][7][8]. Although this concept might be recognizable, it must be accepted that the packaging design of LEDs and the organization of phosphor layers are vital to effectively determine the luminous efficiency, especially the color rendering index (CRI) [9][10][11].…”

Section: Introductionmentioning

confidence: 99%

Enhancing color quality of WLEDs with dual-layer remote phosphor geometry

That

Loan²,

Tho

et al. 2020

Materials Science-Poland

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Usually, remote phosphor structures are beneficial in terms of flux but unfavorable in terms of color quality compared to conformal phosphor or in-cup phosphor packages. To eliminate this disadvantage, many studies have focused on increasing the chromatic quality of the remote phosphor configuration, which requires great efforts in improving two parameters of color: color rendering index (CRI) and color quality scale (CQS). CRI is known as the most useful quantitative method used to measure the ability of a light source to reproduce the colors of illuminated objects faithfully and naturally. Similarly, CQS is also a method of lighting quality determination and analysis, especially used as an alternative to the unsaturated CRI colors. In this paper, we proposed dual-layer remote phosphor structure as a novel method of CRI and CQS enhancement to improve WLEDs’ color quality. Five alike WLEDs but having different color temperatures in the range of 5600 K to 8500 K were applied in this study. The idea behind the study is to place a red phosphor layer SrwFxByOz:Eu2+,Sm2+ on the yellow phosphor layer YAG:Ce3+ and then determining an appropriate concentration of SrwFxByOz:Eu2+,Sm2+ added to achieve the highest color quality. The results point out that SrwFxByOz:Eu2+,Sm2+ brings great benefits to the improvement of CRI and CQS parameters. Specifically, the higher the SrwFxByOz:Eu2+,Sm2+ concentration results in the greater CRI and CQS, owning to the enriched red light components in the WLEDs. However, the flux has a tendency of dropping when SrwFxByOz:Eu2+,Sm2+ concentration rises excessively. This has been proved by using the Mie-scattering theory and the Lambert-Beer law. The results of this article are essential references for manufacturing WLEDs with higher chromatic quality.

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Preparation and characterization of SiO2-coated Sr4A114O25:Eu2+, Dy3+/light conversion agent yellow phosphor

Cited by 5 publications

References 12 publications

Research Progress of Light Wavelength Conversion Materials and Their Applications in Functional Agricultural Films

Research Progress of Light Wavelength Conversion Materials and Their Applications in Functional Agricultural Films

The impacts of Ba₂Li₂Si₂O₇:Sn²⁺,Mn²⁺ and CaMgSi₂O₆:Eu²⁺,Mn²⁺ particles on the optical properties of remote phosphor LED

Enhancing color quality of WLEDs with dual-layer remote phosphor geometry

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Preparation and characterization of SiO2-coated Sr4A114O25:Eu2+, Dy3+/light conversion agent yellow phosphor

Cited by 5 publications

References 12 publications

Research Progress of Light Wavelength Conversion Materials and Their Applications in Functional Agricultural Films

Research Progress of Light Wavelength Conversion Materials and Their Applications in Functional Agricultural Films

The impacts of Ba2Li2Si2O7:Sn2+,Mn2+ and CaMgSi2O6:Eu2+,Mn2+ particles on the optical properties of remote phosphor LED

Enhancing color quality of WLEDs with dual-layer remote phosphor geometry

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The impacts of Ba₂Li₂Si₂O₇:Sn²⁺,Mn²⁺ and CaMgSi₂O₆:Eu²⁺,Mn²⁺ particles on the optical properties of remote phosphor LED