Organic Dopant for OLED Luminous Efficiency

The patent replaces expensive phosphorescent dopants containing heavy metals (iridium, platinum, copper, beryllium) with a fluorescent dopant having a simple molecular structure. This substitution eliminates the need for costly rare earth metals while maintaining high luminous efficiency through the designed chromophore structure with electron-withdrawing groups and electron-donating cores, directly resolving the contradiction between luminous efficiency and manufacturing cost.

The patent achieves high luminous efficiency without heavy metals by optimizing molecular parameters of the fluorescent dopant. Specifically, the design incorporates electron-withdrawing groups (W1, W2) and electron-donating cores with specific structural parameters (L1, L2, X1-X16, Z1-Z2, M1-M2) that tune the energy levels and optical properties. This parameter optimization allows the fluorescent dopant to achieve efficiency comparable to phosphorescent materials while avoiding costly heavy metal elements.

The patent simplifies the dopant structure by segmenting the molecular design into functional modules: electron-withdrawing groups (W1, W2) attached to electron-donating cores (L1, L2 with specific heterocyclic structures). This modular segmentation creates a fluorescent dopant with a simpler molecular architecture compared to complex phosphorescent compounds, reducing synthesis difficulty and device complexity while maintaining high luminous efficiency through the coordinated function of these segments.

The patent replaces complex phosphorescent dopants requiring heavy metals with a simpler fluorescent dopant structure. The fluorescent dopant uses common organic molecules with well-defined structures ( Chemical Formula 1) rather than complex coordination compounds of heavy metals, significantly reducing compound complexity and simplifying the overall device structure while achieving comparable luminous efficiency.