کد مقاله کد نشریه سال انتشار مقاله انگلیسی نسخه تمام متن
1493240 1510774 2016 9 صفحه PDF دانلود رایگان
عنوان انگلیسی مقاله ISI
Multilayer design of hybrid phosphor film for application in LEDs
موضوعات مرتبط
مهندسی و علوم پایه مهندسی مواد سرامیک و کامپوزیت
پیش نمایش صفحه اول مقاله
Multilayer design of hybrid phosphor film for application in LEDs
چکیده انگلیسی


• PDMS/phosphor composite coatings were prepared by spraying on PC substrate.
• Cross-linking mechanism is hindered by the presence of phosphor particles.
• Electrostatic interaction of phosphor particles causes heterogeneity in films.
• Sample with stacking layers shows better optical performance than mixture layer.
• A simple Monte Carlo Simulation verifies the superiority of stacking over mixture.

Crosslinked polydimethylsiloxane (PDMS) composite coatings containing luminescent micrometer-sized yellow Y3Al5O12:Ce3+ (YAG:Ce3+) particles were prepared by spraying for potential applications in solid-state lighting. Blue light was down converted by phosphor particles to produce white light, yet poor color properties of YAG:Ce3+ stemmed from a deficiency of red. When nitride-based red phosphor was simply blended into the system, the electrostatic interaction of negatively charged YAG:Ce3+ and positively charged red phosphor particles caused remarkable clustering and heterogeneity in particle dispersion. Consequently, the light is dominantly blue and shifted to cold white. In other case, phosphor particles were sprayed onto the diffused polycarbonate substrate in stacked layers. Coatings with >80% inorganic content by mass with a thickness of 60 μm were subjected to thermal crosslinking, which the presence of the phosphor particles obstructed, presumably due to the hindrance of large phosphor particles in the diffusion of PDMS precursors. The coating of YAG:Ce3+ first followed by red phosphor in stacked layers produced better light output and color properties than the coating obtained by spraying the mixture at once. Monte Carlo simulation validated the hypothesis.

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ناشر
Database: Elsevier - ScienceDirect (ساینس دایرکت)
Journal: Optical Materials - Volume 60, October 2016, Pages 422–430
نویسندگان
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