Highly stable perovskite quantum dots (PeQDs) are developed using excess Zn precursor and trioctylphosphine‐oxide (TOPO). They not only have high quantum efficiency and sharp full width at half maximum values (15–30 nm) but also have improved long‐term stability at high temperature. They have EQE (%) and current efficiency (Cd A−1) of (7.12%, 9.93 Cd A−1) for red, (6.06%, 32.5 Cd A−1) for green, and (0.56%, 0.88 Cd A−1) for blue‐emitting devices, respectively. Also, a new hole-transporting material, poly-2-(9Hcarbazol-9-yl)-5-(4-vinylphenyl)-5H-benzo[b]carbazole (PBCZCZ), was developed for perovskite light-emitting diodes (PeLEDs). The EQE of the green PeLEDs using PBCZCZ was about 2.5 times higher and that of the sky-blue PeLEDs was about 3 times higher than the device made with the commercial HTL of PVK. The operational device lifetimes of the green and sky-blue PeLEDs made with PBCZCZ were about 4.1 and 4.8 times higher than the PVK-containing device.
Three blue fluorescent materials were newly synthesized by attaching triphenylamine side groups at their ortho, meta, and para positions to a dual core moiety of anthracene and pyrene, two chromophores with good luminous efficiency; these three materials were 2-(6-(10-(2-(diphenylamino)phenyl)anthracen-9-yl)-pyren-1-yl)-N,N-diphenylaniline (o-TPA-AP-TPA), 3-(6-(10-(3-(diphenylamino)phenyl)anthracen-9-yl)pyren-1-yl)-N,N-diphenylaniline (m-TPA-AP-TPA), and 4-(6-(10-(4-(diphenylamino)phenyl)anthracen-9-yl)pyren-1-yl)-N,N-diphenylaniline (p-TPA-AP-TPA), respectively. The optical, thermal, and electroluminescence (EL) properties of the synthesized materials were measured. All three materials were found to be real blue emitters in the solution state and display high PLQY values. A device doped with p-TPA-AP-TPA displayed a very high efficiency of 9.14 cd A-1 and an EQE of 8.38% at a high luminance of 5000 cd m-2
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