Revealing the Evolution Processes of Excitons on High Energy Level in Anthracene-Based OLEDs

Article Materials Science, Multidisciplinary

In Situ Quantifying the Physical Parameters Determining the Efficiency of OLEDs Relying on Triplet-Triplet Annihilation Up-Conversion

Shu Xiao et al.

Summary: This article establishes an in situ method to quantify the parameters of triplet excitons and relevant TTA process in organic light-emitting diodes (OLEDs). Through transient electroluminescence technique, the physical parameters can be quantified in situ. The study finds that minimizing triplet quenching and maximizing TTA rate help lower J(TTA), and device efficiency is improved by weakening triplet quenching through blending two materials.

ADVANCED OPTICAL MATERIALS (2022)

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Article Chemistry, Multidisciplinary

Highly Efficient Blue Organic Light-Emitting Diode Based on a Pyrene[4,5-d]Imidazole-Pyrene Molecule

Yulong Liu et al.

Summary: Organic light-emitting diodes (OLEDs) are widely used in flat-panel display screens such as mobile phones and televisions due to their light weight, high flexibility, and energy efficiency. In this study, a highly efficient blue-emitting material for nondoped OLEDs was achieved using a proper donor-acceptor design strategy. The resulting OLED exhibited excellent performance with high brightness, current efficiency, and external quantum efficiency, as well as minimal efficiency roll-off.

CCS CHEMISTRY (2022)

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Article Engineering, Electrical & Electronic

Improved transient electroluminescence technique based on time-correlated single-photon counting technology to evaluate organic mobility

Xianfeng Qiao et al.

Summary: This paper introduces a method for calculating carrier mobility in transient electroluminescence using time-correlated single-photon counting (TCSPC) technique. The experiment shows that the electron mobility obtained using TCSPC technique is slightly higher than that obtained from traditional analog method, and it has weaker dependence on the root of electrical field.

FRONTIERS OF OPTOELECTRONICS (2022)

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Article Multidisciplinary Sciences

Exceptionally efficient deep blue anthracene-based luminogens: design, synthesis, photophysical, and electroluminescent mechanisms

Runda Guo et al.

Summary: This study reports the rational design and synthesis of two new deep blue luminogens, achieving high efficiency deep blue emissions in non-doped electroluminescent devices. The unprecedented electroluminescent efficiency is attributed to the combined effects of higher-order reversed intersystem crossing and triplet-triplet up-conversion. This research offers a new approach to resolve the shortage of high efficiency deep blue fluorescent emitters.

SCIENCE BULLETIN (2021)

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Article Chemistry, Physical