Metal Nanocluster Single Emissive Layer White Light-Emitting Diodes with EQE of 7.3
Guizhong Luo1, Fujun Zhang1, Ziwen Yu2
1State Key Laboratory of Integrated Optoelectronics, College of Electronic Science and Engineering, College of Integrated Circuits, Jilin University, Changchun130012, China.
Abstract:
While white light-emitting diodes (LEDs) based on metal nanoclusters (NCs) are currently widely desired, due to limitations in the difficulty of controlling emission wavelengths and the susceptibility of luminescence performance to external influences, metal NC white light-emitting diodes (WLEDs) are still not sufficiently developed. In this regard, we employed the bimetallic alkynyl clusters [Au6Ag2(C2C13H11O)6(PPh2C4H8PPh2)3](ClO4)2 (i.e., Au6Ag2 NCs) incorporated with 4,4',4″-tris(carbazol-9-yl)-triphenylamine (TCTA) as a multifunctional ligand that serves to construct new luminescent centers and reduce film defects to achieve single emissive layer (SEL) WLEDs. As a result, the optimal SEL WLEDs achieve a maximum external quantum efficiency of 7.3% and a peak luminance of 1038 cd/m2 with a color rendering index of 93, which represents the high performance of the SEL WLEDs in inorganic materials. This work exemplifies the success of the metal NCs involved in WLEDs and offers a simple yet effective strategy to demonstrate high-performance metal NC WLEDs.
