Fluorescence Manipulation of Carbon Dots by 1D Photonic Crystals,Advanced Optical Materials

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Fluorescence Manipulation of Carbon Dots by 1D Photonic Crystals
Advanced Optical Materials ( IF 8.0 ) Pub Date : 2018-02-28 , DOI: 10.1002/adom.201701262
Yuxin Wu ₁ , Huaizhong Shen ₁ , Shunsheng Ye ₁ , Xiaohuan Zhao ₁ , Kai Zhang ₁ , Junhu Zhang ₁ , Bai Yang ₁

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Luminescent carbon dots (CDs) hold great potential in the light‐emitting diode (LED) application on account of their high photostability and eco‐friendliness. The utilization of LED in display requires pixel sources of pure and saturated colors. To optimize the broad emission of CDs, a versatile approach for narrowing the fluorescence of CDs via 1D photonic crystals (1DPCs) is developed. The 1DPC reported herein has sandwiched a thicker layer of CDs in the middle of two hybrid periodic laminar structures, yielding a transmittance dip. CDs are utilized as prepared without further purification. The transmittance dip is able to be tuned by altering the thickness of layers. Such background thus permits the adjustment of structural properties to narrow the full width at half‐maximum (FWHM) and manipulate the emission color of LED device (composed of a GaN chip and the 1DPC). The transmittance dip enhances the fluorescence intensity, which is quite different from the traditional color filter such as liquid crystal. Furthermore, the mechanism of fluorescent manipulation is confirmed by the assistance of a finite‐difference time‐domain (FDTD) simulation. Such fluorescence tuning not only molds emission properties of CDs but also provides possibilities for the construction of more efficient devices for color purification.

中文翻译：

一维光子晶体对碳点的荧光操纵

发光碳点（CD）具有很高的光稳定性和生态友好性，因此在发光二极管（LED）应用中具有巨大的潜力。在显示器中使用LED需要纯色和饱和色的像素源。为了优化CD的广泛发射，开发了一种通过一维光子晶体（1DPC）来缩小CD荧光的通用方法。本文报道的1DPC在两个混合周期性层流结构的中间夹有一个较厚的CD层，从而产生了透射率下降。CD按原样使用，无需进一步纯化。可以通过改变层的厚度来调节透射率下降。因此，这种背景可以调整结构特性，以缩小半峰全宽（FWHM）并控制LED器件（由GaN芯片和1DPC组成）的发射颜色。透射率下降会增强荧光强度，这与传统的彩色滤光片（例如液晶）有很大的不同。此外，借助有限差分时域（FDTD）模拟，可以确认荧光操纵的机理。这种荧光调节不仅塑造了CD的发射特性，而且还为构建更有效的颜色纯化设备提供了可能性。有限差分时域（FDTD）模拟的帮助证实了荧光操纵的机制。这种荧光调节不仅塑造了CD的发射特性，而且还为构建更有效的颜色纯化设备提供了可能性。有限差分时域（FDTD）模拟的帮助证实了荧光操纵的机制。这种荧光调节不仅塑造了CD的发射特性，而且还为构建更有效的颜色纯化设备提供了可能性。

更新日期：2018-02-28

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