Blue organic light-emitting diodes based on phenyl-bridged fluoranthene and triphenylene derivatives

Luminescent‐Substituted Fluoranthenes—Synthesis, Structure, Electrochemistry, and Optical Properties

“…[31][32][33][34][35] The moderately high photoluminescence quantum yields in the solid phase (F = 0.18-0.42) are due to the presence of greaters teric hindrance in the molecules because of the introduction of bulky substituents, which increases the flexibility and decreases electronic coupling between the molecules; therefore, this behavior is analogoust os imilar fluoranthene derivatives. [10,13,36] Aggregation formation or excimer coupling usuallyi nduces ab athochromic shift of the emission maxima in the solid phase, [11,35] as observed in the case of 2a-2c.O nthe other hand, the compounds that exhibit aggregation-induced blue-shifted emission (AIBSE) phenomena have also been reported. [33] The blue-shift-ed solid-phase emission, as in the case of 2d and 2e,i sq uite different to explain because the mechanismo ft his phenomena is not clear.…”

Blue emitting materials containing dibenzo[b,d]furan and dibenzo[b,d]thiophene for organic light-emitting diodes

“…However, the blue materials have problems for exciton instability, limited charge injection, and lifetime in device because of intrinsic wide energy band-gap. [5][6][7] Therefore, numerous blue emitting derivatives were investigated such as anthracene, 8,9) triphenylamine, 10) and carbazole. 11) However, their EL properties are needed to be improved for the practical applications.…”