Highly thermal-stable organic light-emitting diodes with a bulk heterojunction interfacial modification layer

Abstract

We report highly thermal-stable organic light-emitting diodes (OLEDs) by introducing a interfacial modification layer (IML), consisting of the N,N'-bis(naphthalen-1-yl)-N,N'-bis(phenyl)-benzidine (NPB):MoO3 bulk heterojunction. The IML can increase the thermal resistance of 4,4′-cyclohexylidenebis[N,N-bis(4-methylphenyl)benzenamine] (TAPC) hole transport layer to be higher than its glass transition temperature. The OLED with the IML can endure a high-temperature of 100 °C with the current efficiency of 51.82 cd A−1 and low efficiency roll-off. The optimized thermal stability of OLED is not only due to the thermally stable IML but also resulted from the well-matched energy level between anode and TAPC with the help of IML.

Study on the Interfacial Morphology and Optoelectrical Performance of Thermal‐Shocked Organic Light‐Emitting Diodes

“…In practical applications, it requires a certain tolerance of the device to hightemperature environments. [15][16][17] Therefore, the stability of the devices under thermal shock is one of the research focuses in this field. Thermal shock refers to cooling down the devices after rapid heating and repeating multiple times.…”

Effect of the Glass Transition Temperature of Organic Materials on Exciton Recombination Region of Deep Blue OLED under Thermal Stress

“…[1][2][3][4] Despite the advantages of OLEDs, thermal stability remains a key obstacle to its development. [5][6][7][8] High temperature affects the carrier transport and exciton recombination region, limiting the electroluminescent performance and thermal stability of OLEDs. [9][10][11][12] Specifically, to realize ideal full-color displays, efficient blue OLED is crucial since it can significantly reduce the power consumption of the full-color display.…”