A5021674151- Organic Light-Emitting Diodes Research
- Perovskite Materials and Applications
- Conducting polymers and applications
- Organic Electronics and Photovoltaics
- Quantum Dots Synthesis And Properties
- Luminescence and Fluorescent Materials
- Chalcogenide Semiconductor Thin Films
- Molecular Junctions and Nanostructures
- Thin-Film Transistor Technologies
- Synthesis and Properties of Aromatic Compounds
- Photonic and Optical Devices
- 2D Materials and Applications
- Solid-state spectroscopy and crystallography
- Nanocluster Synthesis and Applications
- Graphene research and applications
- Semiconductor Lasers and Optical Devices
- Diamond and Carbon-based Materials Research
- Advanced Fiber Optic Sensors
- Carbon Nanotubes in Composites
South China University of Technology
2021-2025
State Key Laboratory of Luminescent Materials and Devices
2022-2023
Shandong University of Science and Technology
2018
Quasi-2D perovskites have long been considered to favorable "energy funnel/cascade" structures and excellent optical properties compared with their 3D counterparts. However, most quasi-2D perovskite light-emitting diodes (PeLEDs) exhibit high external quantum efficiency (EQE) but unsatisfactory operating stability due Auger recombination induced by current density. Herein, a synergetic dual-additive strategy is adopted prepare films low defect density environmental using 18-crown-6...
Abstract High‐quality hosts are indispensable for simultaneously realizing stable, high efficiency, and low roll‐off blue solution‐processed organic light‐emitting diodes (OLEDs). Herein, three solution processable bipolar with successively reduced triplet energies approaching the T 1 state of thermally activated delayed fluorescence (TADF) emitter developed evaluated high‐performance OLED devices. The smaller energy gap between host guest allows quenching long‐lived excitons to reduce...
Abstract Quasi‐2D perovskites show great promise for light‐emitting diodes owing to suppressed non‐radiative losses enabled by the energy funneling/cascading nanostructures. However, red emission quasi‐2D perovskites, these ideal landscapes efficient perovskite (PeLEDs) can rarely be achieved due detrimental aggregation of low‐dimensional ligands in precursors, leading poor device efficiency and stability. Here, a ligand‐modulated dimensionality control strategy is explored achieve uniform...
Despite multiple-resonance thermally activated delayed fluorescence (MR-TADF) emitters with small full-width at half maximum are attractive for wide color-gamut display and eye-protection lighting applications, their inefficient reverse intersystem crossing (RISC) process long exciton lifetime induce serious efficiency roll-off, which significantly limits development. Herein, a novel device concept of building highly efficient tricomponent exciplex multiple RISC channels is proposed to...
Abstract The band‐edge electronic structure of lead halide perovskites ( ABX 3 ) is composed the orbitals B and X components can be tuned through composition BX 6 octahedron. Although A‐site cations do not directly contribute to near‐edge states, bandgap 3D metal affected by A‐cations octahedron tilting or lattice size variation. Here, as confirmed Rietveld refinement results X‐ray diffraction characterization, competition between expansion octahedral identified for first time in emission...
We demonstrate a kind of perovskite/organic hybrid white electroluminescent device, where an ultrathin doping-free organic phosphorescent interlayer is embedded between p-type hole transport layer and n-type electron to give p–i–n heterojunction unit, which superimposed by onto quasi-two-dimensional perovskite layer. The unique carrier character the leads broad recombination region approaching unit. As result, pure-red emission from sky-blue were simultaneously achieved generate with peak...
Abstract Chirality is a magical property that exists in nature universally, ranging from the spin of microscopic electrons to galaxies. Furthermore, circularly polarized organic electroluminescent materials have promising prospects improving brightness displays, but there are still some problems. At present, most chiral thermally activated delayed fluorescence small molecules show relatively low luminescence (CPL) dissymmetry factors between 10 −4 and −3 because electric dipole‐allowed...
Exciton annihilation is one of the main factors affecting operational lifetimes organic light-emitting diodes (OLEDs). Constructing an appropriate host–emitter system helpful in reducing exciton process and has a positive influence on stability device. Herein, "hot exciton" fluorescent material PAC with dual-channel triplet harvesting ability including reverse intersystem crossing from high-lying states triplet–triplet been explored as host narrowband multiresonance thermally activated...
Abstract Lead‐based perovskite light‐emitting diodes (PeLEDs) is gaining significant attention for their outstanding optoelectronic properties. However, the intrinsic lead toxicity in these materials presents serious environmental and health risks, limiting further development. Here, highly efficient zinc‐lead alloy quasi‐2D perovskites are developed through Zn 2+ substitution additive engineering. The improves tolerance factors, increases radiative recombination rates, suppresses...
Abstract Perovskite light‐emitting diodes (PeLEDs) are promising candidates for displays and solid‐state lighting due to their tunable colors, high conversion efficiency, low cost. However, the performance of deep blue PeLEDs lags far behind that near‐infrared, red, green ones. Here, ligand concentration on perovskite surface is regulated by introducing a small organic molecule 3‐(5,9‐dioxa‐13b‐boranaphtho [3,2,1‐d,e] anthracene‐7‐yl)‐9‐phenyl‐9H‐carbazole (BOCzPh) reduce defects in...
Abstract Mixed halide perovskites are widely investigated as emitters for efficient light‐emitting diodes owing to their excellent optoelectronic properties. Compared with red and green emissions, encouraging progress in efficiency blue emission has only been achieved sky‐blue region. A high Cl/Br ratio is indispensable achieve deep‐blue emission, which often leads pronounced halogen migration perovskite (PeLEDs) thus diminished efficacy. To avoid the negative effects of excessive chloride...
Metal halide perovskites have attracted extensive attention in next-generation solid-state lighting and displays due to their fascinating optoelectronic properties. However, the toxicity of lead (Pb) impedes practical application. Herein, we report an efficient Zn-alloyed quasi-two-dimensional (quasi-2D) pure-red perovskite light-emitting device (PeLED) by introducing zinc ions (Zn2+) into lattice partially substituting Pb2+. The substitution Zn2+ is confirmed X-ray diffraction,...
Abstract Quasi‐two‐dimensional (quasi‐2D) perovskites, consisting of multi‐quantum wells (MQWs) separated by organic intercalating cations, exhibit high luminescence efficiency while the photophysical processes involved remain partially obscure due to uncertainty MQWs structure. Herein, a synergetic dual‐additive strategy is adopted prepare quasi‐2D perovskite films, where 18‐crown‐6 and tris(4‐fluorophenyl)phosphine oxide are utilized suppress formation low‐dimensional diminish defect...
Recently, quasi-two-dimensional (Q-2D) perovskites have received much attention due to their excellent photophysical properties. Phase compositions in Q-2D obvious effect on the device performance. Here, efficient green perovskite light-emitting diodes (PeLEDs) were fabricated by employing o-fluorophenylethylammonium bromide (o-F-PEABr) and 2-aminoethanol hydrobromide (EOABr) as mix-interlayer ligands. are rationally optimized through composition interlayer engineering. Meanwhile,...
Limited by the inefficient energy transfer from blue thermally activated delayed fluorescence (TADF) material to complementary color fluorescent dopant and unwanted charge trapping effect, it is challenging achieve a spectrally stable, high efficiency low roll-off solution-processed single-emission-layer (SEL) white organic light-emitting diodes (WOLEDs). Herein, highly efficient all-fluorescence SEL-WOLED with suppressed stable electroluminescence spectra achieved introducing hybridized...
Purely organic luminescent materials exhibiting afterglow emission after photoexcitation have been developed recently and hold great promise for future applications, while the from electroexcitation remains rare inefficient. Here, electroluminescence was achieved based on an dimer system with high photoluminescence quantum yield unprecedented long-lived thermally activated delayed fluorescence (TADF) characters. The strong π-π interactions aggregation structures can suppress nonradiative...