Robust singlet fission process in strong absorption π-expanded diketopyrrolopyrroles

Abstract

Via π-expanded design strategy, a new robust SF system, Ex-DPP, has been successfully developed with high extinction coefficient, good molecular rigidity and excellent SF properties.

Exploiting heterocycle aromaticity to fabricate new hot exciton materials

“…4, for details see Section 4 of the ESI†). 50–52 After photo-excitation, the triplet excited state absorption (ESA) of the sensitizer TX ( 3 TX*) appears around 626 nm at the initial 0.5 μs. Then it decays rapidly and transforms into multi-peak ESA bands of TNP triplets ( 3 TNP*) at 3 μs.…”

“…Triplet sensitization experiments were performed using nanosecond laser flash photolysis measurements using the previously described instruments and experimental conditions. 50–52…”

“…Triplet sensitization experiments were performed using nanosecond laser flash photolysis measurements using the previously described instruments and experimental conditions. [50][51][52] Device fabrications OLED devices were fabricated with a structure of ITO/MoO 3 (3 nm)/TAPC (40 nm)/TCTA (10 nm)/mCP:EML (x wt%; 20 nm)/ TmPyPB (40 nm)/LiF (1 nm)/Al (100 nm). EL spectra and CIE coordinates were measured by using a computer-controlled PR-655 spectral scan spectrometer.…”

“…4, for details see Section 4 of the ESI †). [50][51][52] After photo-excitation, the triplet excited state absorption (ESA) of the sensitizer TX ( 3 TX*) appears around 626 nm at the initial 0.5 ms. Then it decays rapidly and transforms into multi-peak ESA bands of TNP triplets ( 3 TNP*) at 3 ms. In combination with theoretical calculations, the ESA peaks of 3 TNP* around 914, 710, 652, 594 and 518 nm are assigned to T 1 -T 2 (1.32 eV), T 1 -T 3 (1.69 eV), T 1 -T 4 (1.85 eV), T 1 -T 7-8 (B2.0 eV) and T 1 -T 9-10 (B2.3 eV) transitions, respectively.…”

Intramolecular singlet fission and triplet exciton harvesting in tetracene oligomers for solar energy conversion

“…1 Subsequently, SF has shown vigorous development, and great efforts have been devoted to developing new efficient SF materials and revealing the SF mechanism. Many chromophores have been found to meet the energy requirement of SF, where the singlet state energy (E S 1 ) should be larger or equal to twice the triplet state energy (E T 1 ) (E S 1 # 2E T 1 ), such as acenes (anthracene, 19 tetracene, 20 pentacene, [21][22][23][24] hexacene [25][26][27] and their derivatives), polyene, [28][29][30][31][32][33][34] 1,3-diphenylisobenzofuran, 35 diketopyrrolopyrrole, [36][37][38][39][40] perylenediimide, [41][42][43][44][45][46] boron dipyrromethene (BODIPY), [47][48][49][50] and other chromophores. 37,[51][52][53][54][55][56][57][58][59][60][61] These molecules have been summarized in some comprehensive reviews on this eld.…”