Key Laboratory of Interface Science and Engineering in Advanced Materials, (Taiyuan University of Technology), Ministry of Education, Taiyuan 030024, China.
Nanoscale. 2018 Jun 14;10(23):11211-11221. doi: 10.1039/c8nr01834k.
First, oleophilic carbon dots (CDs) with a fluorescence quantum yield (QY) of 41% were synthesized by a one-pot microwave-assisted carbonization method. Then, CD-based electroluminescent light emitting diodes (CD-LEDs) were prepared. The impact of CD aggregation on the brightness of CD-LEDs was studied. The results show that, to some extent, with the decrease of the aggregation of the CD film, the luminescence quenching of the CD-LEDs gradually decreased, and the luminance of the CD-LEDs gradually increased. Hence, in order to improve the dispersion of CDs and reduce the aggregation of CDs and the luminescence quenching of the devices, host-guest doping was adopted to effectively improve the brightness of CD-LEDs. In this work, the yellow emission of the doped devices is mainly derived from the direct carrier trapping on CDs. Moreover, white and yellow CD-LEDs were obtained from the same oleophilic CDs by tuning the structure of the devices. The white CD-LEDs exhibit a high color rendering index (CRI) of 83 with a luminance of 455.2 cd m-2. The yellow CD-LEDs show the maximum brightness of 339.5 cd m-2 and excellent color stability. The results show that the luminescence quenching of CD-LEDs was resisted and the brightness of CD-LEDs was improved by using host-guest doping.
首先，通过一锅微波辅助碳化法合成了具有 41%荧光量子产率（QY）的亲油性碳点（CDs）。然后，制备了基于 CD 的电致发光发光二极管（CD-LEDs）。研究了 CD 聚集对 CD-LEDs 亮度的影响。结果表明，在一定程度上，随着 CD 膜聚集程度的降低，CD-LEDs 的发光猝灭逐渐降低，CD-LEDs 的亮度逐渐增加。因此，为了提高 CDs 的分散性，降低 CDs 的聚集程度和器件的发光猝灭，采用主客体掺杂有效地提高了 CD-LEDs 的亮度。在这项工作中，掺杂器件的黄色发射主要源于 CDs 上的直接载流子俘获。此外，通过调整器件的结构，从相同的亲油性 CDs 获得了白色和黄色 CD-LEDs。白色 CD-LEDs 的显色指数（CRI）高达 83，亮度为 455.2 cd/m2。黄色 CD-LEDs 显示出 339.5 cd/m2 的最大亮度和出色的颜色稳定性。结果表明，通过主客体掺杂抑制了 CD-LEDs 的发光猝灭，提高了 CD-LEDs 的亮度。
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