Quantum Dot Composition for Charge Injection Balance

The quantum dot composition is segmented into two distinct quantum dot types with different metal-to-chalcogenide molar ratios. The first quantum dot (with higher metal ratio) specifically improves hole injection characteristics, while the second quantum dot (with lower metal ratio) specifically improves electron injection characteristics. This segmentation allows each component to target a specific charge carrier type, resolving the contradiction by enabling simultaneous improvement of both hole and electron injection while maintaining high luminescence efficiency.

The invention utilizes parameter changes by varying the metal-to-chalcogenide molar ratio between the two quantum dot types. By controlling this compositional parameter, the quantum dots exhibit different surface states that selectively improve hole or electron injection. This parameter-based differentiation simplifies the overall composition design compared to using multiple complex materials, as the variation in a single molar ratio parameter enables tailored charge injection properties while maintaining compositional simplicity and ease of synthesis.