Quenching‐Resistant Polymer Carbon Dot Preserving Emission Color Consistency in Solid‐State

Abstract Solid‐state luminescent carbon dot without dispersion matrices is studied to overcome aggregation‐caused quenching, but it usually shows spectral shift between solution‐ and solid‐state accompanying a dramatic decrease of fluorescence intensity, which hinders a real application. Herein, polymer carbon dot (PCD) showing solid‐state luminescence without red‐shift is synthesized by low‐temperature reaction. The PCD solution and solid have the same emission peaks at 434 nm and similar absolute quantum yields of 68.2% and 62.7%, respectively, which is uncommon feature compared to other carbon dots. The mechanism for solid‐state luminescence and emission color consistency is investigated by structural analysis of the PCD compared to carbon dot that shows red‐shift in solid‐state. The PCD is utilized into light‐emitting diode application as a phosphor, and little color change in emission without significant decrease in luminous efficacy is achieved even with high loading fraction (50 wt%), opening the possibility of real application in solid‐state lighting.