Triplet fusion delayed fluorescence materials for OLEDs

Luo, Yanju; Lu, Zhiyun; Huang, Yan

doi:10.1016/j.cclet.2016.06.002

Cited by 41 publications

(26 citation statements)

References 55 publications

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“…8 Anthracene and its derivatives are model materials for triplet annihilation, often used for TTA-enhanced OLEDs, especially in the blue spectral range due to a relatively small conjugation length. 1 Nearly maximal values of EQE, peaking at 12%, 7−9 were achieved in anthracene-based OLEDs. Additionally, TTA-exhibiting anthracenes are also widely used in lowpower light upconversion, where low-energy photons are converted to high energy by TTA.…”

Section: ■ Introductionmentioning

confidence: 99%

Triplet–Triplet Annihilation in 9,10-Diphenylanthracene Derivatives: The Role of Intersystem Crossing and Exciton Diffusion

et al. 2017

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Triplet–triplet annihilation (TTA) is an attractive way to boost the efficiency of conventional fluorescent organic light-emitting diodes (OLEDs). TTA-active anthracene derivatives are often considered as state-of-the-art emitters due to the proper energy level alignment. In this work, TTA properties of a series of highly fluorescent nonsymmetrical anthracene compounds bearing 9-(4-arylphenyl) moiety and 10-(4-hexylphenyl) fragments were assessed. Two different methods to enhance the TTA efficiency are demonstrated. First, the intensity of TTA-based delayed fluorescence directly depended on the intersystem crossing (ISC) rate. This ISC rate can be significantly enhanced in more conjugated compounds due to the resonant alignment of S1 and T2 energy levels. While enhanced ISC rate slightly quenches the intensity of prompt fluorescence, the rise of the triplet population boosts the intensity of resultant delayed fluorescence. Second, the triplet annihilation rate can be significantly enhanced by optimization of triplet exciton diffusion regime in the films of anthracene derivatives. We show that the proper layer preparation technology has a crucial influence on uniformity and energetic disorder of the film. This enhances the nondispersive triplet diffusion and increases the resulting delayed fluorescence intensity.

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Section: ■ Introductionmentioning

confidence: 99%

Triplet–Triplet Annihilation in 9,10-Diphenylanthracene Derivatives: The Role of Intersystem Crossing and Exciton Diffusion

et al. 2017

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“…Besides singlet exciton fission, triplet exciton fusion can be observed in organic solids. This back transfer from the triplet to the singlet system is significant for increasing the efficiency of fluorescent organic light-emitting diodes 18,19 and is also responsible for the delayed fluorescence feature observed in time-resolved photoluminescence (TRPL) measurements as long-living luminescence tail. Triplet exciton fusion can only occur for 2ET1≥ES1.…”

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confidence: 99%

Interfacial Molecular Packing Determines Exciton Dynamics in Molecular Heterostructures: The Case of Pentacene–Perfluoropentacene

Rinn

Breuer

Wiegand

et al. 2017

ACS Appl. Mater. Interfaces

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The great majority of electronic and optoelectronic devices depend on interfaces between p-type and n-type semiconductors. Finding matching donor-acceptor systems in molecular semiconductors remains a challenging endeavor because structurally compatible molecules may not necessarily be suitable with respect to their optical and electronic properties, and the large exciton binding energy in these materials may favor bound electron-hole pairs rather than free carriers or charge transfer at an interface. Regardless, interfacial charge-transfer exciton states are commonly considered as an intermediate step to achieve exciton dissociation. The formation efficiency and decay dynamics of such states will strongly depend on the molecular makeup of the interface, especially the relative alignment of donor and acceptor molecules. Structurally well-defined pentacene-perfluoropentacene heterostructures of different molecular orientations are virtually ideal model systems to study the interrelation between molecular packing motifs at the interface and their electronic properties. Comparing the emission dynamics of the heterosystems and the corresponding unitary films enables accurate assignment of every observable emission signal in the heterosystems. These heterosystems feature two characteristic interface-specific luminescence channels at around 1.4 and 1.5 eV that are not observed in the unitary samples. Their emission strength strongly depends on the molecular alignment of the respective donor and acceptor molecules, emphasizing the importance of structural control for device construction.

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“…It is well-known that anthracene-based luminophores are prone to undergo triplet-triplet annihilation upconversion [1][2][3][4]20,[25][26][27][28]37]. The nonlinear Luminance-Current density characteristics of the nondoped deep blue OLEDs at low current density (Fig.…”

Section: Electroluminescent Propertiesmentioning

confidence: 99%

Efficient soluble deep blue electroluminescent dianthracenylphenylene emitters with CIE y (y ≤ 0.08) based on triplet-triplet annihilation

et al. 2019

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Triplet fusion delayed fluorescence materials for OLEDs

Cited by 41 publications

References 55 publications

Triplet–Triplet Annihilation in 9,10-Diphenylanthracene Derivatives: The Role of Intersystem Crossing and Exciton Diffusion

Triplet–Triplet Annihilation in 9,10-Diphenylanthracene Derivatives: The Role of Intersystem Crossing and Exciton Diffusion

Interfacial Molecular Packing Determines Exciton Dynamics in Molecular Heterostructures: The Case of Pentacene–Perfluoropentacene

Efficient soluble deep blue electroluminescent dianthracenylphenylene emitters with CIE y (y ≤ 0.08) based on triplet-triplet annihilation

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Triplet fusion delayed fluorescence materials for OLEDs

Cited by 41 publications

References 55 publications

Triplet–Triplet Annihilation in 9,10-Diphenylanthracene Derivatives: The Role of Intersystem Crossing and Exciton Diffusion

Triplet–Triplet Annihilation in 9,10-Diphenylanthracene Derivatives: The Role of Intersystem Crossing and Exciton Diffusion

Interfacial Molecular Packing Determines Exciton Dynamics in Molecular Heterostructures: The Case of Pentacene–Perfluoropentacene

Efficient soluble deep blue electroluminescent dianthracenylphenylene emitters with CIE y (y ≤ 0.08) based on triplet-triplet annihilation

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Efficient soluble deep blue electroluminescent dianthracenylphenylene emitters with CIE y (y ≤ 0.08) based on triplet-triplet annihilation