科研之友
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摘要
Rational design and fabrication of multicolor fluorescent sources represent one of the significant challenges in the development of high-performance solid-state lighting, tunable coherent lasing, and full-color display technologies. However, generation of simultaneous multicolor emission, especially white light generation with a wide color gamut is usually beyond the ability of a single material. Heterogeneous structures made by combinations of red, green, and blue emission building blocks are bulky, inefficient, complicated, and costly. Here reported is a bottom-up strategy to generate simultaneous multicolor emission with continuous tunability in a single monolithic material based on the "nanocrystals-in-glass composite" (NGC) architecture. In this approach, a self-sustained low-temperature solution combustion process enables homogeneous solvent dispersion and eventually stable immobilization of multiple nanocrystals in transparent matrix. With transparency of up to 80%, further demonstrated is drawing of fiber from the melt of these combustion-processed NGC materials. The optical spectra of the as-drawn glass fiber can be precisely tuned and clustering is effectively suppressed. Moreover, the NGC materials exhibit remarkable anti-thermal quenching behavior at temperatures of up to 200 degrees C. The bottom-up strategy for NGC provides a versatile platform for the fabrication of high-performance multifunctional fiber-based devices for advanced applications in lasers, illumination, displaying, and biophotonics.
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