Carbon dots with efficient solid-state photoluminescence towards white light-emitting diodes,Journal of Materials Chemistry C

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Carbon dots with efficient solid-state photoluminescence towards white light-emitting diodes
Journal of Materials Chemistry C ( IF 5.7 ) Pub Date : 2017-10-25 00:00:00 , DOI: 10.1039/c7tc04155a
Jinyang Zhu _{1,

2,

3,

4,

5} , Xue Bai _{1,

2,

3,

4,

5} , Yue Zhai _{1,

2,

3,

4,

5} , Xu Chen _{1,

2,

3,

4,

5} , Yongsheng Zhu _{5,

6,

7,

8} , Gencai Pan _{1,

2,

3,

4,

5} , Hanzhuang Zhang _{3,

4,

5,

9} , Biao Dong _{1,

2,

3,

4,

5} , Hongwei Song _{1,

2,

3,

4,

5}

Affiliation

Carbon dots (CDs) exhibit excellent ultraviolet (UV) absorption and tunable photoluminescence over the full visible light range, which endows CDs with huge potential to be designed as efficient full-color emitting phosphors for UV to white light conversion. However, the low quantum yield (QY) for white light emission and solid-state quenching dramatically limit their optoelectronic applications. We proposed an effective strategy for modulating the emitting states of colloidal CDs by introducing hexadecyltrimethyl ammonium bromide. Consequently, white light emission with tunable correlated color temperature from 8121 K to 3623 K was realized. Furthermore, we dispersed CDs in a PVP matrix for solid-state films, where the solid-state quenching was effectively avoided. A white light-emitting QY of 38.7% was thus achieved through the inhibition of non-radiative electron–hole recombination as well as the cooperation between the intrinsic state of the carbogenic cores and the surface-related state of the organic ligands. The white light emitting QY is much higher than that of other reported CDs (ca. 15% in the soluble state and not reported in the solid-state) and is comparable to that of the nanophosphors with the highest UV pumped single-component white light emissions reported in the literature.

中文翻译：

具有有效固态光致发光的碳点朝向白色发光二极管

碳点（CD）在整个可见光范围内均具有出色的紫外线（UV）吸收能力和可调的光致发光特性，这使CD具有巨大的潜力，可被设计成高效的全色发射磷光体，用于将UV转换为白光。但是，用于白光发射和固态猝灭的低量子产率（QY）极大地限制了它们的光电应用。我们提出了一种有效的策略，通过引入十六烷基三甲基溴化铵来调节胶体CD的发射态。结果，实现了具有从8121 K到3623 K可调的相关色温的白光发射。此外，我们将CD分散在用于固态膜的PVP基质中，从而有效避免了固态淬灭。发出白色光的QY为38。因此，通过抑制非辐射性电子-空穴复合以及碳化原核的固有状态与有机配体的表面相关状态之间的协同作用，可达到7％。发出白光的QY远高于其他报告的CD（约。在可溶状态下为15％，在固态状态下未报告），与文献中报道的具有最高UV泵浦单组分白光发射的纳米磷光体相当。

更新日期：2017-11-16

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