Wu Jiangchen, Liu Jianan, Liu Xinghua, Zheng Jingxia, Chen Lin, Yang Yongzhen, Su Chunhui
School of Material Science and Engineering, Changchun University of Science and Technology, Changchun 130022, China.
Key Laboratory of Interface Science and Engineering in Advanced Materials, Ministry of Education, Taiyuan University of Technology, Taiyuan 030024, China.
Molecules. 2024 Oct 10;29(20):4787. doi: 10.3390/molecules29204787.
To obtain carbon dots (CDs) with narrow full width at half maximum (FWHM) and long-wavelength emission, carbon sources with high conjugate sizes and abundant functional groups can be employed to synthesize CDs. In this study, orange-emissive carbon dots (OCDs) were synthesized with phloroglucinol and rhodamine B as precursors. When the molar ratio of them was 30:1, and ethanol was served as the solvent, OCDs with optimized emission wavelength at approximately 580 nm, an FWHM of 30 nm, and a quantum yield (QY) of 27.31% were obtained. Subsequently, the OCDs were incorporated into polyvinyl alcohol (PVA) to fabricate solid-state OCD/PVA fluorescent films, which exhibited an FWHM of 47 nm. The PVA matrix facilitated the dispersion of OCDs, thereby suppressing non-radiative energy transfer among the OCDs and enhancing luminescence efficiency. Consequently, compared with OCDs, the OCD/PVA film exhibited significant luminescent enhancement, and the QY of the composite film was increased to 84.74%. Moreover, OCD/PVA film showed good transmittance and thermal stability. This research offers a solid theoretical and experimental foundation for the potential applications of CDs in the field of solid-state lighting.
为了获得半高宽（FWHM）窄且发射波长较长的碳点（CDs），可以采用具有高共轭尺寸和丰富官能团的碳源来合成碳点。在本研究中，以间苯三酚和罗丹明B为前驱体合成了橙色发光碳点（OCDs）。当它们的摩尔比为30:1且以乙醇作为溶剂时，获得了发射波长优化在约580nm、半高宽为30nm且量子产率（QY）为27.31%的OCDs。随后，将OCDs掺入聚乙烯醇（PVA）中制备固态OCD/PVA荧光膜，其半高宽为47nm。PVA基质促进了OCDs的分散，从而抑制了OCDs之间的非辐射能量转移并提高了发光效率。因此，与OCDs相比，OCD/PVA膜表现出显著的发光增强，复合膜的量子产率提高到了84.74%。此外，OCD/PVA膜表现出良好的透光率和热稳定性。本研究为碳点在固态照明领域的潜在应用提供了坚实的理论和实验基础。
