Exciplex-forming systems with extremely high RISC rates exceeding 107 s−1 for oxygen probing and white hybrid OLEDs

Mahmoudi, Malek; Keruckas, Jonas; Leitonas, Karolis; Kutsiy, Stepan; Volyniuk, Dmytro; Gražulevičius, Juozas V.

doi:10.1016/j.jmrt.2020.12.058

Cited by 23 publications

(11 citation statements)

References 42 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…This k RISC / k T nr ratio has to be higher than unity (the case of 2AC-2CF 3 Ph ) for efficient TADF emitters. 40,41 As was previously mentioned, the theoretical calculations yielded 1 CT values of 2.37 eV, 2.70 eV and 2.78 eV for 2PO-2CF 3 Ph , 2PS-2CF 3 Ph , and 2AC-2CF 3 Ph respectively. We also noted that X-ray data for the phenoxazine moiety in 2PO-2CF 3 Ph is slightly saddled (∼15°) rather than flat as predicted by geometry optimisation.…”

Section: Resultssupporting

confidence: 62%

1,4-Bis(trifluoromethyl)benzene as a new acceptor for the design and synthesis of emitters exhibiting efficient thermally activated delayed fluorescence and electroluminescence: experimental and computational guidance

et al. 2022

Self Cite

View full text Add to dashboard Cite

show abstract

Section: Resultssupporting

confidence: 62%

1,4-Bis(trifluoromethyl)benzene as a new acceptor for the design and synthesis of emitters exhibiting efficient thermally activated delayed fluorescence and electroluminescence: experimental and computational guidance

et al. 2022

Self Cite

View full text Add to dashboard Cite

show abstract

“…The amplitude increases because more acceptor molecules are available for complex formation with the increase in the acceptor concentration. The decrease in the decay time of the exciplex follows the nonlinear Stern–Volmer dynamic quenching relation: − where τ 0 is the initial decay time of the exciplex and τ is the quenched decay time of the exciplex on increasing acceptor concentration. The best fitted Stern–Volmer (SV) function shown in Figure b has dual SV constants, K SV1 and K SV2 , for different sites of the exciplex, having values 1.002×10 6 M –1 and 2.8 ×10 4 M –1 , respectively, and f 1 and f 2 are their respective fractional contribution.…”

Section: Results and Discussionmentioning

confidence: 99%

Effect of Diffusion on Photo-Induced Excited-State Energy Transfer between Fluorescent Semiconducting Molecules: Tris-(8-hydroxyquinoline) Aluminum and 6,13-Bis (Triisopropylsilylethynyl) Pentacene

et al. 2021

View full text Add to dashboard Cite

In the present work, the effect of diffusion on photo-induced excitation energy transfer between fluorescent organic semiconducting molecules tris-(8hydroxyquinoline) aluminum (AlQ 3 , n-type donor) and 6,13-bis (triisopropylsilylethynyl) pentacene (TIPS-P, p-type acceptor) at a concentration range of 10 −4 to 10 −6 M in chloroform solution was studied by steady-state and time-domain fluorescence measurements. The donor−donor interaction strength is significantly weaker than the donor−acceptor strength (the ratio of donor−donor to donor−acceptor interaction strengths is 1.55 × 10 3 ) in chloroform solution. Considerable overlap between donor emission and acceptor absorption and high interaction parameters favors direct Forster energy transfer and exciplex (D*A) formation. Excitation energy migration does not take place between donor molecules. However, material diffusion appears to influence the donor decay dynamics by forming charge-transfer exciplex complexes and modulating the excitation energy transfer rate from the metal-to-ligand chargetransfer (MLCT) state of the donor to vibronic states of the acceptor at a low acceptor concentration. At high acceptor concentrations, energy transfer from the excited donor to acceptor occurs through the exchange mechanism along with Forster long-range dipole−dipole interactions, and the corresponding critical transfer distance is found to be ∼42 Å. A blue-shift in AlQ 3 emission, a red-shift in the 0−0 vibronic peak of TIPS-P, and quenching of exciplex decay following Stern−Volmer quenching are observed, with the increase in acceptor concentration. No evidence of excimer formation is observed in acceptor molecules.

show abstract

“…As for reaching high-performance OLEDs based on exciplex, effective exciplex systems are essential [58][59][60]. Meanwhile, bulk exciplex has been attested to be a useful emitter and host for dyes that relies on an efficient and balanced charge transportation that can be achieved by employing donor and acceptor materials with high charge mobilities [61][62][63][64][65][66], whereas multi-doping technology and precise control of doping concentration aggravate manufacturing complexity [67][68][69][70][71]. Compared with bulk exciplex-based devices, interface exciplex-based devices can be easily achieved using doping-free technology.…”

Section: Doping-free Oleds Based On Interface Exciplexmentioning

confidence: 99%

Recent Advances of Interface Exciplex in Organic Light-Emitting Diodes

et al. 2022

View full text Add to dashboard Cite

The interface exciplex system is a promising technology for reaching organic light-emitting diodes (OLEDs) with low turn-on voltages, high efficiencies and long lifetimes due to its unique virtue of barrier-free charge transport, well-confined recombination region, and thermally activated delayed fluorescence characteristics. In this review, we firstly illustrate the mechanism frameworks and superiorities of the interface exciplex system. We then summarize the primary applications of interface exciplex systems fabricated by doping and doping-free technologies. The operation mechanisms of these OLEDs are emphasized briefly. In addition, various novel strategies for further improving the performances of interface exciplex-based devices are demonstrated. We believe this review will give a promising perspective and attract researchers to further develop this technology in the future.

show abstract

Exciplex-forming systems with extremely high RISC rates exceeding 107 s−1 for oxygen probing and white hybrid OLEDs

Cited by 23 publications

References 42 publications

1,4-Bis(trifluoromethyl)benzene as a new acceptor for the design and synthesis of emitters exhibiting efficient thermally activated delayed fluorescence and electroluminescence: experimental and computational guidance

1,4-Bis(trifluoromethyl)benzene as a new acceptor for the design and synthesis of emitters exhibiting efficient thermally activated delayed fluorescence and electroluminescence: experimental and computational guidance

Effect of Diffusion on Photo-Induced Excited-State Energy Transfer between Fluorescent Semiconducting Molecules: Tris-(8-hydroxyquinoline) Aluminum and 6,13-Bis (Triisopropylsilylethynyl) Pentacene

Recent Advances of Interface Exciplex in Organic Light-Emitting Diodes

Contact Info

Product

Resources

About