High-efficiency organic light-emitting diodes with exciplex hosts

Abstract

Exciplex forming co-hosts have been applied to fabricate high-efficiency organic light-emitting diodes (OLEDs) due to the merits of bipolarity, 100% exciton harvesting, preferred dipole alignment, and sensitizing effects.

Evolution of pure hydrocarbon hosts: simpler structure, higher performance and universal application in RGB phosphorescent organic light-emitting diodes

“…Thus, one can note that the lifetime of the EML using mSTPh, 0.86 ms, is considerably reduced compared to others, which might help to reduce the triplet density and the possibility of triplet-triplet annihilation (TTA). [32][33][34][35][36] This feature is an important point in the very high device performance obtained. Therefore, the very high performance reached with mSTPh can be assigned to the combination of high E T1 , well balanced mobility and short deactivation lifetime.…”

Color‐Stable, Efficient, and Bright Blue Light‐Emitting Electrochemical Cell Using Ionic Exciplex Host

“…[7] Exciplex systems comprising donor and acceptor molecules have been widely employed as hosts in blue organic light-emitting diodes (OLEDs) by taking their advantages of facile carrier injection and bipolar charge-transport. [39][40][41][42] Moreover, exciplex systems with a small singlet-triplet energy gap (ΔE ST ) undergo reverse intersystem crossing (RISC) from the triplet to the singlet (i.e., TADF), [41,43] which benefits their use as hosts in lightemitting devices because RISC redistributes the triplets and facilitates the energy transfer from the host to the dopant. [41,42,44] Despite these merits, TADF exciplex host has so far not been applied to LECs.…”

Steric hindrance dependence on the spin and morphology properties of highly oriented self-doped organic small molecule thin films

“…[65][66][67][68] The fluorescence signal for compounds 1-3 thin films were also fully quenched, consistent with the formation of exciplexes, and leads us to propose that these and other self-doped PDIs may be ideally suited to organic light emitting diode (OLED) applications. 69 We also note the possibility that spin pairing between PDI•-and PDI•-is also plausible if R'-NR2•+ were to act as a reversible photoacid, or undergo some other reversible transformation.…”