Size-tunable emission refers to the ability of quantum dots to emit light at different wavelengths based on their size, which is a fundamental characteristic of these nanostructures. This property allows researchers and engineers to design quantum dots for specific applications by manipulating their size during synthesis, enabling a broad range of colors in optical devices and biological systems. The size-dependent emission is tied to quantum confinement effects, where smaller quantum dots emit light at shorter wavelengths (blue) and larger ones emit at longer wavelengths (red).
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