Organic light-emitting diodes (OLED) have attracted increasing attention due to their excellent properties, such as self-luminosity, high color gamut and flexibility, and potential applications in display, wearable devices and lighting. The emitters are the most important composition in OLEDs, mainly classified into fluorescent compounds (first generation), metal phosphorescent complexes (second generation), and thermally activated delayed fluorescence (TADF) materi-als (third generation). In this review, we summarize the advances of novel emitters of organic metal complexes in the last decade, focusing on coinage metals (Cu, Ag, and Au) and non-precious metals (Al, Zn, W, and alkali metal). Also, the design strategy of d 10 and Au(III) complexes was discussed. We aim to provide guidance for exploring efficient metal complexes beyond traditional phosphorescent complexes.
Non-traditional phosphorescent complexes2.1. d 10 complexes (Cu(I), Ag(I), Au(I))Cu(I), Ag(I), Au(I) complexes with closed shell d 10 configuration have been researched extensively for the most promising alternative emitters to traditional precious metal complexes in OLEDs. [13] In this section, some typical research progress in the [a] X.