Abstract
A new luminescent composite film resulting from the dispersion of luminescent organic dyes in a single-layered hydroxide (SLH)-type inorganic matrix has been developed. Two fluorescent organic dyes emitting visible light upon blue LED excitation were investigated in this study: dicyanomethylene (DCM) and pyranine (HPTS). These dyes exhibit broad emission bands that cover a large part of the visible spectrum. The concept developed in our work consisted in keeping SLH in its wet form to ensure a good dispersion of the fluorescent dyes prior to immobilizing the hybrid materials in a silicone polymer to achieve luminescent composite films. We demonstrate that these coatings stacked upon each other and placed above a blue LED lead to white-light emission with suitable photometric parameters for applications in lighting or display devices: colour temperature of 5409 K and colour rendering index (CRI) of 81.
Highlights
Light-emitting diode (LED) devices are the most developed lighting systems today. 95% of LEDs found on the market generate white light by combining the blue light of a semiconductor diode (GaN or InGaN) with the broad yellow emission of the Y3Al5O12:Ce3+ (YAG:Ce) phosphor
We have successfully developed luminescent composite films based on the mixture of a single-layered hydroxide and organic luminescent dyes
The organic dyes dicyanomethylene and pyranine were chosen according to their photoluminescent characteristics, which are excitation with blue light and an emission spectrum covering a wide range of the visible spectrum
Summary
Light-emitting diode (LED) devices are the most developed lighting systems today. 95% of LEDs found on the market generate white light by combining the blue light of a semiconductor diode (GaN or InGaN) with the broad yellow emission of the Y3Al5O12:Ce3+ (YAG:Ce) phosphor. 95% of LEDs found on the market generate white light by combining the blue light of a semiconductor diode (GaN or InGaN) with the broad yellow emission of the Y3Al5O12:Ce3+ (YAG:Ce) phosphor. LED gives a low colour-rendering index (CRI < 80) and a high correlated colour temperature (CCT > 5000 K), which requires the addition of expensive and moisture-sensitive red phosphors (fluoride or nitride) [1]. These phosphors involve rare-earthdoped inorganic phosphors that are extensively used in hightechnology devices, LED lighting, mobile phones, flat panel display and wind turbines.
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