Rational design of pyridine-containing emissive materials for high performance deep-blue organic light-emitting diodes with CIEy ~ 0.06

Pyrene and triphenylamine substituted cyanostyrene and cyanostilbene derivatives with dual-state emission for high-contrast mechanofluorochromism and cell imaging

“…PYTPA displays the maximum emission peak at 2.199 eV (564 nm) with a Φ value of 0.49 in THF solution. Interestingly, the emission peak of PYPHTPA in THF solution appears within a shorter wavelength region of 2.255 eV (550 nm) but a higher QY of Φ = 0.77 is obtained due to the additional phenyl ring between the pyrene and the double bond 33 (Fig. 1b).…”

Rational design of phenanthroimidazole derivatives with hybridized local and charge-transfer characteristics to achieve efficient blue emission in non-doped OLEDs

“…Non-doped OLEDs based on DPy-PPI and DmPy-PPI show CIE coordinates of (0.14, 0.06) and (0.15, 0.08) and external quantum efficiencies of 4.24% and 3.74%, respectively. 37 Additionally, many research groups have also made indelible contributions to the development of blue PIbased emitters. 16,[38][39][40][41][42] Based on the pioneering research work mentioned above, two new blue PI derivatives 4-(2-(3,5-di(9H-carbazol-9-yl) phenyl)-1H-phenanthro [9,10-d]imidazol-1-yl)benzonitrile (DCCPPI) and 4-(2-(3 0 ,5 0 -di(9H-carbazol-9-yl)-[1,1 0 -biphenyl]-4yl)-1H-phenanthro [9,10-d]imidazol-1-yl)benzonitrile (DCBCPPI) were designed and synthesized.…”

“…Non-doped OLEDs based on DPy-PPI and DmPy-PPI show CIE coordinates of (0.14, 0.06) and (0.15, 0.08) and external quantum efficiencies of 4.24% and 3.74%, respectively. 37 Additionally, many research groups have also made indelible contributions to the development of blue PI-based emitters. 16,38–42…”

Impact of peripheral groups on pyrimidine acceptor-based HLCT materials for efficient deep blue OLED devices

“…Subsequently, a series of light-emitting molecules based on PPI were reported by changing the substituents at the 1 and 2 positions of imidazole. 3,6–18 However, the class of PPI acceptors is relatively single, significantly limiting the development of such materials. Although some other acceptors, 19 such as pyrene-imidazole 20,21,22–24 and 9,10-diphenylimidazole, 25–27 have been developed, there is still a need to develop more effective acceptor planes for expanding this HLCT material system.…”