无溶剂法大量制备高效红光碳点及其在白光器件中的应用

以邻苯二胺、 2,5-二氨基苯磺酸和三氯化铝为原料, 通过无溶剂法大量制备了高效的红色荧光碳点 (R-CDs). 制得的碳点尺寸大约为2.4 nm, 含有13%的氮元素, 主要由高度石墨化的碳核及覆盖在其表面的大量官能团构成. 在不同的波长光激发下, 碳点在乙醇溶液中表现出不依赖于激发的红光发射, 其荧光峰位于 704 nm, 最大量子产率达到22%. 由于R-CDs具有优异的光学性质, 利用其构筑了紫外光激发的碳基白色发光二极管, 其色坐标为(0.33, 0.33), 非常接近自然光. 该研究为高效红色荧光碳点的大量制备提供了一种新路径, 同时拓宽了其在白光器件中的应用.

Solvent-free and High-yielding Synthesis of Highly Efficient Red-emitting Carbon Dots and Their Application in White Light Devices

Highly efficient red-emitting carbon dots（R-CDs） were synthesized on a large scale by a solvent-free method using o-phenylenediamine， 2，5-diaminobenzene sulfonic acid and aluminum trichloride as raw materials. The obtained R-CDs are approximately 2.4 nm in diameter， have a nitrogen content of 13%， and consist of a highly graphitized carbon core coated with abundant functional groups. Under light illumination with different wavelengths， the R-CDs in ethanol solution show an excitation-independent red emission at 704 nm， with a quantum yield（QY） as high as 22%. By virtue of their excellent optical properties， an UV-excited carbon dots-based pure white light emitting diode（WLEDs） was successfully constructed with a color coordinate of （0.33，0.33）， which is very close to that of natural sunlight. This study paves a new path for the large scale preparation of R-CDs with high QY， and broadens their application in luminescent devices.