Efficient phenanthroimidazole-styryl-triphenylamine derivatives for blue OLEDs: a combined experimental and theoretical study

Abstract

Blue emitting devices based on 2-(4′-9H-carbazol-9-yl)-[1,1′-styryl]-4-yl-1-benzylpiperidine-1H-phenanthro[9,10-d]imidazole (Cz-BPIS) exhibits blue emission with CIE coordinates of (0.16, 0.09), current density of 1.91 cd/A, power efficiency of 1.63 lm/W and external quantum efficiency of 2.61%.

A triphenylacrylonitrile phenanthroimidazole cored butterfly shaped AIE chromophore for blue and HLCT sensitized fluorescent OLEDs

“…The larger decrease of k nr in film than in solution may be because of restricted intermolecular rotation (RIR) which promotes strong aggregation induced emission enhancement (AIEE). 29…”

Efficient M-shaped blue emitters having a high conjugation extent with improved roll-off efficiency

“…S3, ESI †). [53][54][55][56][57][58][59][60] The effective spin-orbit coupling (SOC: S 1 H ˆSOT 5 ) of S 1 with the T 3 state also leads to enhanced EUE. 61 The calculated SOC of S 1 with T 3 follows the order of TPA-2SPPITPA (0.52 cm À1 ) 4 TPA-2SPPITPA (0.30 cm À1 ).…”

Near UV/Deep‐Blue Phenanthroimidazole‐Based Luminophores for Organic Light‐Emitting Diodes: Experimental and Theoretical Investigation

“…Up to now various conjugated systems, including pyrene, fluorene, anthracene, and phenanthroimidazole materials have been synthesized and used in OLED devices. Among the above‐mentioned materials, phenanthroimidazole is a deep‐blue emitting chromophore, has attracted remarkable attention because of the simple synthesis procedure, high fluorescence quantum yield, excellent thermal stability, and potential bipolar properties . For example, Ma et al.…”

“…In order to obtain deep‐blue emitters, it has been suggested that by changing the molecular connectivity with the alkyl or alkene spacer and changing the linkage position from para to ortho or meta, the extent of conjugation could be well confined, However, there are few research groups applying this strategy for producing blue shift emission (blue emission) and high device performance simultaneously …”