Experimental study demonstrates spectral narrowing and fluorescence enhancement in carbon dot light-emitting diodes, indicating pathways toward pure color displays.
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.
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Wu et al. (2018) studied this question.
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