New exciplex systems composed of triazatruxene donors and N-heteroarene-cored acceptors

Abstract

<p>Three triazatruxene-based donors <bold>Tr-Me</bold>, <bold>Tr-Ph</bold>, and <bold>Tr-Tol</bold> were intermixed with three acceptors <bold>3P-T2T</bold>, <bold>3P-T2P</bold>, and <bold>3P-Pyr</bold> equipping with different heteroarene cores to generate an array of nine blends to probe the feasibility of exciplex formation.</p>

Diluted exciplex concentrations in organic light emitting diodes for blue-shifted spectra and improved efficiency

“…increased mCP concentrations also supported the high device efficiency. 39 Therefore, the suppressed exciton concentration quenching with the increased molecular distance improved PLQYs with multiple RISC channels and efficient energy transfer from a high energy exciplex to a low energy exciplex are responsible for the high EL efficiency.…”

“…21 Hu et al achieved a highly efficient yellow exciplex with an emission peak at 566 nm and an EQE of 9.7% by using triazatruxene-based molecules Tr-Tol as the donor and 2,4,6-tris(3-(1H-pyrazol-1-yl)phenyl)-1,3,5-triazine (3P-T2T) as the acceptor, respectively. 22 However, the average efficiency level of exciplexes is lower than those of phosphorescent and TADF emitters and the spectra also present some shift with the change of mixed ratio or operation voltage. 23 Hence, the luminous mechanism needs to be explored further and the luminous efficiency needs to be improved in exciplex OLEDs.…”

Aggregation Control, Surface Passivation, and Optimization of Device Structure toward Near‐Infrared Perovskite Quantum‐Dot Light‐Emitting Diodes with an EQE up to 15.4%

“…The QD coverage on the HTL films is evidenced by atomic force microscopy (AFM) and scanning electron microscopy (SEM). An ETL (3′,3′″,3′′′′′‐(1,3,5‐triazine‐2,4,6‐triyl)tris(([1,1′″‐biphenyl]‐3‐carb)); CN‐T2T) [ 35–37 ] was introduced to replace the typical ETL (1,3,5‐tris(‐1‐phen‐y‐1H‐benzimidazol‐2‐yl) benzene (TPBi)) in NIR‐I QLEDs. The carrier‐transport mechanism is elucidated using ultraviolet photoelectron spectroscopy (UPS).…”

Functionalized Crystalline N-Trimethyltriindoles: Counterintuitive Influence of Peripheral Substituents on Their Semiconducting Properties

“…Owing to its excellent hole-transporter ability, numerous triindole-based materials have been successfully incorporated in OFETs [ 1 , 2 , 3 , 4 ] and dye-sensitized [ 5 , 6 , 7 ] or perovskite-based [ 8 , 9 ] solar cells exhibiting excellent performances. On the other hand, their favorable optical properties have been successfully exploited in the fabrication of efficient OLEDs [ 10 , 11 , 12 , 13 , 14 ], waveguiding materials [ 15 ] and photoconductors [ 16 ]. In addition, the triindole core, has been identified as an excellent aromatic core in the construction of high mobility p -type semiconducting discotic liquid crystals.…”