Synthesis of red, green and blue carbon quantum dots and construction of multicolor cellulose-based light-emitting diodes

Small Structures 2024

Synthesis of red, green and blue carbon quantum dots and construction of multicolor cellulose-based light-emitting diodes

Xinrui Chen, Xing Han, Caixia Zhang, Xue Ou, Xiaoli Liu, Junhua Zhang, Wei Liu, Arthur J. Ragauskas, Xueping Song*, Zhanying Zhang .

摘要：Light-emitting diodes (LEDs) are widely used in lighting and display applications. Carbon quantum dots (CQDs), which have high biocompatibility, high resistance to photobleaching, and full-spectrum luminescence, have inherent advantages as fluorescent materials for LED devices. Herein, multicolor CQDs are prepared by a new reagent engineering strategy due to the difference of effective conjugate length and the surface electron-withdrawing groups of CQDs. White CQDs are realized by mixing blue, green, and red CQDs proportionally. Then, the aggregation-caused quenching phenomenon of CQDs is suppressed through the hydrogen-bonding network of cellulose nanofibrils (CNFs). Multicolor fluorescent films are prepared from CQDs and CNFs by simple mixing and casting methods. Finally, thin-film encapsulation based on the photosensitive resin ABPE-10 coating can be realized and rapidly assembles into fluorescent films with different light-emitting colors into LED devices, leading to have superior thermal performance compared with conventional LEDs. White LEDs have excellent white-light illumination performance, with Commission Internationale de L'Eclairage color coordinates of (0.33, 0.37), a correlated color temperature of 5688 K, and a color rendering index of 86. This strategy provides a convenient and scalable pathway for low-cost, environmentally friendly, and high-performance CQDs-based LEDs.

Multicolor carbon quantum dots (CQDs) are synthesized by a novel reagent engineering strategy. The aggregation-caused quenching phenomenon of CQDs is suppressed by utilizing the hydrogen-bonding network of cellulose nanofibrils. Fast thin-film encapsulation (approximate to 3 min) of high heat dissipation, high-performance multicolor light-emitting diodes (LEDs) is achieved based on UV-cured acrylic resin, and high-performance white LEDs are obtained.

DOI：https://doi.org/10.1002/sstr.202470034