Anthracene and carbazole based asymmetric fluorescent materials for high-efficiency deep-blue non-doped organic light emitting devices with CIEy=0.06

Simple and efficient non-doped deep-blue and white organic light-emitting diode based on hybridized local and charge transfer (HLCT) materials

“…It can be seen that the PL spectra of pCzAnN and TBAN show a blue emission with a peak at 453 nm and a yellow emission with a peak located at 588 nm, which are consistent with our previous reports. 21,23 A large spectral overlap between the absorption bands of TBAN and the PL band of pCzAnN indicates that an efficient energy transfer can happen via Förster energy transfer (FRET) when pCzAnN is combined with TBAN in the same OLED. 31–33 Furthermore, the transient PL decay spectra in the toluene solution were also investigated, as shown in Fig.…”

“…17,34 The delayed microsecond lifetime cannot be observed, and a large energy gap between the S 1 and the T 1 states also rules out the TADF mechanism for pCzAnN and TBAN. 21,23,35,36…”

“…19,20 Recently, our group reported an excellent blue material with obvious HLCT characteristics, 9-(4-(10-(naphthalen-2-yl)anthracen-9-yl)phenyl)-9H-carbazole (pCzAnN), realizing outstanding EL performance with an emission peak at 444 nm and maximum EQE reaching 6.0%, and pCzAnN exhibits superior electron-transferring capacity than the typical electron transport material 1,3,5-tri[(3pyridyl)-phen-3-yl]benzene (TmPyPB). 21,22 Coincidentally, a yellow HLCT material 4-(7-(10-(naphthalen-2-yl)anthracene-9-yl)benzo[c] [1,2,5]thiadiazol-4-yl)-N,N-diphenylaniline (TBAN) was also developed by our group in previous studies, 23 which also achieved excellent EL performance with an emission peak at 596 nm and EQE of 5.7%, and shows significant hole transport capacity. The complementary emission and opposite carrier transport characteristics imply a great potential to fabricate ultra-simple and highperformance white OLEDs.…”

Enhancement of Blue Doping-Free and Hyperfluorescent Organic Light Emitting Diode Performance through Triplet–Triplet Annihilation in the Derivatives of Anthracene and Carbazole

“…26−29 Some of them have a carbazole moiety as a donor. 30,31 They are primarily used as emitters in OLEDs. 32 A relatively new method for efficient harvesting of triplet excitons in OLEDs is based on hyperfluorescence.…”

O,S-Acetals in a New Modification of oxo-Friedel–Crafts–Bradsher Cyclization—Synthesis of Fluorescent (Hetero)acenes and Mechanistic Considerations

“…Anthracene and its derivatives are particularly attractive due to high thermal stability [ 3 ], relatively good solubility, low price, blue photoluminescent [ 4 ] and electroluminescent properties [ 5 ]. Many blue-light-emitting materials with an anthracene core structure [ 6 , 7 , 8 , 9 , 10 , 11 , 12 , 13 , 14 , 15 , 16 , 17 , 18 ] have been developed; however, deep blue is still in demand due to the lack of electrically and photochemically stable light-emitting materials [ 19 , 20 ].…”