A host material consisting of a phosphinic amide directly linked donor–acceptor structure for efficient blue phosphorescent organic light-emitting diodes

Wada, Atsushi; Yasuda, Takuma; Zhang, Qisheng; Yang, Yu; Takasu, Isao; Enomoto, Shotaro; Adachi, Chihaya

doi:10.1039/c3tc00939d

Cited by 57 publications

(29 citation statements)

References 34 publications

(6 reference statements)

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“…The similar FMO energy levels of DA n indicated the contributions from the same functional groups to these orbitals, namely aryl amine for the HOMO and naphthyl for the LUMO, in accord with DFT simulation results. Furthermore, according to previous reports,9j, 11 the HOMO and LUMO energy levels of parent molecule DPEPO without aryl amine functional groups were −6.1 and −2.5 eV. Therefore, the incorporation of aryl amine groups in DA n effectively improved the hole‐injecting ability, while the electron‐injecting abilities inherited from their naphthyl and DPPO were comparable.…”

Section: Resultssupporting

confidence: 66%

Rationally Investigating the Influence of T₁ Location on Electroluminescence Performance of Aryl Amine Modified Phosphine Oxide Materials

Han

Zhu

et al. 2014

Chemistry A European J

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The correspondence between triplet location effect and host-localized triplet-triplet annihilation and triplet-polaron quenching effects was performed on the basis of a series of naphthyldiphenylamine (DPNA)-modified phosphine oxide hosts. The number and ratio of DPNA and diphenylphosphine oxide was adjusted to afford symmetrical and unsymmetrical molecular structures and different electronic environments. As designed, the first triplet (T1 ) states were successfully localized on the specific DPNA chromophores. Owing to the meso- and multi-insulating linkages, identical optical properties and comparable electrical performance was observed, including the same first singlet (S1 ) and T1 energy levels to support the similar singlet and triplet energy transfer and the close frontier molecular orbital energy levels. This established the basis of rational investigation on T1 location effect without interference from other optoelectronic factors.

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Section: Resultssupporting

confidence: 66%

Rationally Investigating the Influence of T₁ Location on Electroluminescence Performance of Aryl Amine Modified Phosphine Oxide Materials

Han

Zhu

et al. 2014

Chemistry A European J

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“…23 This leads to a preoccupation 55 that ternary D-A systems with effective intramolecular electronic coupling can hardly realize high triplet energy approaching to 3.0 eV. [24][25][26][27][28][29][30][31][32][33][34] Nevertheless, owing to their superior electrical properties, efficient phosphorescent D-A hosts are emerged in recent years, 32,[35][36][37][38][39][40][41][42][43][44][45][46][47][48][49] even though their intramolecualr electronic coupling is 60 commonly suppressed by meta-, insulating or twisted linkages; while, only few D-A hosts are reported for blue TADF devices. 50 Nevertheless, there are very few reports about high-energy-gap ternary D-A type hosts without any spacers or linkers involved.…”

Section: Introductionmentioning

confidence: 99%

Ternary donor–acceptor phosphine oxide hosts with peculiar high energy gap for efficient blue electroluminescence

et al. 2015

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Ternary donor (D)-acceptor (A)-acceptor (A) molecules are commonly considered as low triplet (T 1 ) energy systems for specific applications. In this work, this preoccupation was redressed by a triangleshaped D-A-A molecule PCImbPO with peculiarly high triplet energy of 3.0 eV. Profiting from the enhanced D-A electronic coupling, electron injecting and transporting ability of PCImbPO was 10 dramatically improved with negligible influences on its highest occupied molecular orbital (HOMO) characteristic. Its particular T 1 configuration adjustment further gives rise to the separated frontier MO and T 1 locations, beneficial to suppress quenching effects. By utilizing PCImbPO as host in blue phosphorescent organic light-emitting diodes (PHOLEDs) and thermally activated delayed fluorescence devices, the impressively high external quantum efficiency beyond 22 and 12% were achieved, 15 respectively. This work established a new understanding of high-energy-gap complicated D-A systems. 65 III), ternary D-A system is almost ideal as host materials with the independent highest occupied molecular orbital (HOMO), lowest unoccupied molecular orbital (LUMO) and T 1 locations, which is conducive to suppressing polarization-induced exciton decomposition (PIED) 51 and triplet-polaron quenching (TPQ) 70 effects. 52-53 Recently, we reported a D-A-D host with a structure of two carbazole donors linked by a phenylphosphine oxide acceptor, which endowed its FIrpic-based blue PHOLEDs with favorable performance owing to its unique dynamically adaptive electrical characteristic. 54 Nevertheless, a more in-depth 75 This journal is © The Royal Society of Chemistry [year]90 CDCl 3 , 400 MHz): δ = 8.19-8.22 (d, J = 7.6 Hz, 2H), 7.77-7.79 (d, J = 8.8 Hz, 2H), 7.41-7.51 (m, 6H), 7.35-7.38 ppm (t, J = 6.8 Hz, 2H); LDI-TOF: m/z (%): 321 (100) [M + ]; elemental analysis (%) for C 18 H

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“…In addition, the EL spectra show similar profiles to those of film PL. But it should be noted that the 0 / 1 vibrational bands at 434 nm is enhanced in EL spectra, while the 0 / 0 vibrational band dominate the PL spectra, which is probably caused by the influence of the microcavity effect [22]. Furthermore, the EL spectra are found to be independent of the driving voltages, as shown by the spectra of G2F3 based device B as an example in Fig.…”

Section: Electroluminescencementioning

confidence: 93%

Novel carbazole dendronized oligofluorenes for solution-processed organic light-emitting diodes

et al. 2015

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A host material consisting of a phosphinic amide directly linked donor–acceptor structure for efficient blue phosphorescent organic light-emitting diodes

Cited by 57 publications

References 34 publications

Rationally Investigating the Influence of T₁ Location on Electroluminescence Performance of Aryl Amine Modified Phosphine Oxide Materials

Rationally Investigating the Influence of T₁ Location on Electroluminescence Performance of Aryl Amine Modified Phosphine Oxide Materials

Ternary donor–acceptor phosphine oxide hosts with peculiar high energy gap for efficient blue electroluminescence

Novel carbazole dendronized oligofluorenes for solution-processed organic light-emitting diodes

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A host material consisting of a phosphinic amide directly linked donor–acceptor structure for efficient blue phosphorescent organic light-emitting diodes

Cited by 57 publications

References 34 publications

Rationally Investigating the Influence of T1 Location on Electroluminescence Performance of Aryl Amine Modified Phosphine Oxide Materials

Rationally Investigating the Influence of T1 Location on Electroluminescence Performance of Aryl Amine Modified Phosphine Oxide Materials

Ternary donor–acceptor phosphine oxide hosts with peculiar high energy gap for efficient blue electroluminescence

Novel carbazole dendronized oligofluorenes for solution-processed organic light-emitting diodes

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Rationally Investigating the Influence of T₁ Location on Electroluminescence Performance of Aryl Amine Modified Phosphine Oxide Materials

Rationally Investigating the Influence of T₁ Location on Electroluminescence Performance of Aryl Amine Modified Phosphine Oxide Materials