&lt;title&gt;Siloxane materials for optical applications&lt;/title&gt;

Su, Kai; DeGroot, Jon V.; Norris, Ann W.; Lo, Peter Y.

doi:10.1117/12.667752

Cited by 15 publications

(6 citation statements)

References 2 publications

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“…Such losses affect all LSCs, but heretofore have generally been negligible compared to self-absorption related losses. This result suggests that significant further improvements in large-area doped QD concentrator performance should be possible using more transparent polymer waveguide materials, for example, optical polysiloxanes or cyclic perfluoropolymers, which have intrinsic attenuation coefficients 1–3 orders of magnitude lower than polyacrylates at visible and near-IR wavelengths. , Importantly, the fact that competitive F max values can be achieved by pairing Si photovoltaics with a phosphor that absorbs little of the solar spectrum illustrates the pivotal importance of eliminating reabsorption losses.…”

Section: Resultsmentioning

confidence: 99%

Zero-Reabsorption Doped-Nanocrystal Luminescent Solar Concentrators

et al. 2014

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Optical concentration can lower the cost of solar energy conversion by reducing photovoltaic cell area and increasing photovoltaic efficiency. Luminescent solar concentrators offer an attractive approach to combined spectral and spatial concentration of both specular and diffuse light without tracking, but they have been plagued by luminophore self-absorption losses when employed on practical size scales. Here, we introduce doped semiconductor nanocrystals as a new class of phosphors for use in luminescent solar concentrators. In proof-of-concept experiments, visibly transparent, ultraviolet-selective luminescent solar concentrators have been prepared using colloidal Mn(2+)-doped ZnSe nanocrystals that show no luminescence reabsorption. Optical quantum efficiencies of 37% are measured, yielding a maximum projected energy concentration of ∼6× and flux gain for a-Si photovoltaics of 15.6 in the large-area limit, for the first time bounded not by luminophore self-absorption but by the transparency of the waveguide itself. Future directions in the use of colloidal doped nanocrystals as robust, processable spectrum-shifting phosphors for luminescent solar concentration on the large scales required for practical application of this technology are discussed.

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Section: Resultsmentioning

confidence: 99%

Zero-Reabsorption Doped-Nanocrystal Luminescent Solar Concentrators

et al. 2014

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“…형광체와 같은 분말 형상 물질의 소수성 코팅에 진공 플라즈 마의 일종인 글로우 방전을 이용한 연구는 문헌에 일부 보고되어 있 으나 [12], 대기압 플라즈마를 이용한 사례는 잘 알려져 있지 않다 [4,13]. 한편, 코팅 전구물질로 널리 사용되고 있는 헥사메틸다이실록 세인(hexamethyldisoloxane, HMDSO)은 우수한 열 안정성 및 화학물 질 저항성, 굴절률 및 기계적 성질의 조절 가능성 그리고 우수한 광 안정성을 가지고 있다 [14]. 또한 실록세인 기반의 고분자는 자외선, 가시광선 및 특정 파장의 적외선을 잘 투과시키고 [15] …”

Section: 서 론unclassified

Surface Coating Treatment of Phosphor Powder Using Atmospheric Pressure Dielectric Barrier Discharge Plasma

Jang¹,

Ihm²,

Trinh³

et al. 2014

Applied Chemistry for Engineering

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This work investigated the hydrophobic coating of silicate yellow phosphor powder in the form of divalent europium-activated strontium orthosilicate (Sr2SiO4:Eu 2+ ) by using an atmospheric pressure dielectric barrier discharge (DBD) plasma with argon as a carrier and hexamethyldisiloxane (HMDSO), toluene and n-hexane as precursors. After the plasma treatment of the phosphor powder, the lattice structure of orthosilicate was not altered, as confirmed by an X-ray diffractometer. The coated phosphor powder was characterized by scanning electron microscopy, fluorescence spectrophotometry and contact angle analysis (CAA). The CAA of the phosphor powder coated with the HMDSO precursor revealed that the water contact angle increased from 21.3° to 139.5° (max. 148.7°) and the glycerol contact angle from 55° to 143.5° (max. 145.3°) as a result of the hydrophobic coating, which indicated that hydrophobic layers were successfully formed on the phosphor powder surfaces. Further surface characterizations were performed by Fourier transform infrared spectroscopy and X-ray photoelectron spectrometry, which also evidenced the formation of hydrophobic coating layers. The phosphor coated with HMDSO exhibited a photoluminescence (PL) enhancement, but the use of toluene or n-hexane somewhat decreased the PL intensity. The results of this work suggest that the DBD plasma may be a viable method for the preparation of hydrophobic coating layer on phosphor powder.

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“…17 In addition, silicone-based polymers are highly transparent to UV, visible, and selected bands of near-infrared (IR) spectra. 18 Hexamethyldisiloxane (HMDSO), that is, a typical siloxane compound is nontoxic and does not produce any harmful compounds during processing.…”

Section: Introductionmentioning

confidence: 99%

Hydrophobic coating of silicate phosphor powder using atmospheric pressure dielectric barrier discharge plasma

2014

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A stable superhydrophobic coating was successfully deposited on commercial silicate-based orange phosphor by using atmospheric pressure dielectric barrier discharge plasma with hexamethyldisiloxane (HMDSO) and HMDSO/toluene mixture as precursors. Owning to the good optical properties, the deposited film acts not only as a hydrophobic protective layer but also as an antireflection optical thin film capable of improving the phosphor photoluminescence efficiency. The plasma-polymerized film based on SiAOASi backbone containing methyl and phenyl nonpolar functional groups exhibited high-water-repellent characteristics. It was found that the water contact angle gradually increased with increasing the aging time and remained unchanged at about 140 after 1-month aging. Besides, the thermal stability of the coated phosphor under high-temperature condition was substantially enhanced by the aging. The findings of this work can contribute to improving the durability and reliability of the phosphor, eventually the long-term stability of phosphor-based light emitting diodes in practical applications. V C 2014 American Institute of Chemical Engineers AIChE J, 60: [829][830][831][832][833][834][835][836][837][838] 2014

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<title>Siloxane materials for optical applications</title>

Cited by 15 publications

References 2 publications

Zero-Reabsorption Doped-Nanocrystal Luminescent Solar Concentrators

Zero-Reabsorption Doped-Nanocrystal Luminescent Solar Concentrators

Surface Coating Treatment of Phosphor Powder Using Atmospheric Pressure Dielectric Barrier Discharge Plasma

Hydrophobic coating of silicate phosphor powder using atmospheric pressure dielectric barrier discharge plasma

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