scholarly journals Efficient Green Quasi-Two-Dimensional Perovskite Light-Emitting Diodes Based on Mix-Interlayer

2022 ◽  
Vol 9 ◽  
Author(s):  
Zirong Wang ◽  
Fanyuan Meng ◽  
Qi Feng ◽  
Shengxuan Shi ◽  
Langwen Qiu ◽  
...  
Keyword(s):  
Radiative Recombination ◽  
High Efficiency ◽  
Light Emitting Diodes ◽  
Photophysical Properties ◽  
Device Performance ◽  
Two Dimensional ◽  
Obvious Effect ◽  
Light Emitting ◽  
Feasible Method ◽  
Maximum Current

Recently, quasi-two-dimensional (Q-2D) perovskites have received much attention due to their excellent photophysical properties. Phase compositions in Q-2D perovskites have 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 the mix-interlayer ligands. Phase compositions are rationally optimized through composition and interlayer engineering. Meanwhile, non-radiative recombination is greatly suppressed by the introduction of mix-interlayer ligands. Thus, green PeLEDs with a peak photoluminescence quantum yield (PLQY) of 81.4%, a narrow full width at half maximum (FWHM) of 19 nm, a maximum current efficiency (CE) of 27.7 cd/A, and a maximum external quantum efficiency (EQE) of 10.4% were realized. The results are expected to offer a feasible method to realize high-efficiency PeLEDs.

Morphology Optimization of Perovskite Films for Efficient Sky-Blue Light Emitting Diodes via a novel Green Anti-Solvent Dimethyl Carbonate

2021 ◽  
Author(s):  
Yong-Wen Zhang ◽  
Zheng-Liang Diao ◽  
Ji-Yang Chen ◽  
Wan-Yi Tan ◽  
Yannan Qian ◽  
...  
Keyword(s):  
Energy Transfer ◽  
Blue Light ◽  
Radiative Recombination ◽  
Dimethyl Carbonate ◽  
High Efficiency ◽  
Light Emitting Diodes ◽  
Two Dimensional ◽  
Light Emitting ◽  
Cascade Energy

Quasi-two-dimensional (quasi-2D) perovskites have been identified as promising emitters for high-efficiency blue PeLEDs, attributed to efficient radiative recombination resulted from the cascade energy transfer from low-n phases to high-n phases....

Highly efficient deep-blue organic light-emitting diodes based on pyreno[4,5-d]imidazole-anthracene structural isomers

2019 ◽  
Vol 7 (33) ◽  
pp. 10273-10280 ◽  
Author(s):  
Hui Liu ◽  
Liangliang Kang ◽  
Jinyu Li ◽  
Futong Liu ◽  
Xin He ◽  
...  
Keyword(s):  
High Efficiency ◽  
Light Emitting Diodes ◽  
Organic Light Emitting Diodes ◽  
Device Performance ◽  
Structural Isomers ◽  
Light Emitting ◽  
Blue Region ◽  
Deep Blue ◽  
Organic Light ◽  
Blue Emitters

By integrating PyI with anthracene, two high-efficiency blue emitters C-BPyIA and N-BPyIA are obtained. Especially, N-BPyIA exhibits decent device performance with an EQEmax of 7.67% in the deep blue region.

scholarly journals Improved Efficiency of Perovskite Light-Emitting Diodes Using a Three-Step Spin-Coated CH3NH3PbBr3 Emitter and a PEDOT:PSS/MoO3-Ammonia Composite Hole Transport Layer

Micromachines ◽  
2019 ◽  
Vol 10 (7) ◽  
pp. 459 ◽  
Author(s):  
Yuanming Zhou ◽  
Sijiong Mei ◽  
Dongwei Sun ◽  
Neng Liu ◽  
Wuxing Shi ◽  
...  
Keyword(s):  
Current Efficiency ◽  
High Efficiency ◽  
Light Emitting Diodes ◽  
Control Device ◽  
Hole Transport ◽  
Transport Layer ◽  
Hole Injection ◽  
Maximum Luminance ◽  
Light Emitting ◽  
Maximum Current

High efficiency perovskite light-emitting diodes (PeLEDs) using PEDOT:PSS/MoO3-ammonia composite hole transport layers (HTLs) with different MoO3-ammonia ratios were prepared and characterized. For PeLEDs with one-step spin-coated CH3NH3PbBr3 emitter, an optimal MoO3-ammonia volume ratio (0.02) in PEDOT:PSS/MoO3-ammonia composite HTL presented a maximum luminance of 1082 cd/m2 and maximum current efficiency of 0.7 cd/A, which are 82% and 94% higher than those of the control device using pure PEDOT:PSS HTL respectively. It can be explained by that the optimized amount of MoO3-ammonia in the composite HTLs cannot only facilitate hole injection into CH3NH3PbBr3 through reducing the contact barrier, but also suppress the exciton quenching at the HTL/CH3NH3PbBr3 interface. Three-step spin coating method was further used to obtain uniform and dense CH3NH3PbBr3 films, which lead to a maximum luminance of 5044 cd/m2 and maximum current efficiency of 3.12 cd/A, showing enhancement of 750% and 767% compared with the control device respectively. The significantly improved efficiency of PeLEDs using three-step spin-coated CH3NH3PbBr3 film and an optimum PEDOT:PSS/MoO3-ammonia composite HTL can be explained by the enhanced carrier recombination through better hole injection and film morphology optimization, as well as the reduced exciton quenching at HTL/CH3NH3PbBr3 interface. These results present a promising strategy for the device engineering of high efficiency PeLEDs.

Design principles of carbazole/dibenzothiophene derivatives as host material in modern efficient organic light-emitting diodes

2017 ◽  
Vol 5 (28) ◽  
pp. 6989-6996 ◽  
Author(s):  
Junming Li ◽  
Shou-Cheng Dong ◽  
Andreas Opitz ◽  
Liang-Sheng Liao ◽  
Norbert Koch
Keyword(s):  
Carrier Transport ◽  
High Efficiency ◽  
Light Emitting Diodes ◽  
Photophysical Properties ◽  
Energy Levels ◽  
Delayed Fluorescence ◽  
Organic Light Emitting Diodes ◽  
Light Emitting ◽  
Organic Light ◽  
Host Materials

Host materials for modern high-efficiency organic light-emitting diodes (OLEDs) based on phosphorescence and thermally activated delayed fluorescence were optimized with respect to thermal stability, photophysical properties, energy levels, and charge carrier transport.

scholarly journals Suppression of non-radiative recombination toward high efficiency perovskite light-emitting diodes

APL Materials ◽  
2019 ◽  
Vol 7 (2) ◽  
pp. 021102 ◽  
Author(s):  
Yuqiang Liu ◽  
Tian Wu ◽  
Yuan Liu ◽  
Tao Song ◽  
Baoquan Sun
Keyword(s):  
Radiative Recombination ◽  
High Efficiency ◽  
Light Emitting Diodes ◽  
Light Emitting

scholarly journals Highly efficient and air-stable Eu(II)-containing azacryptates ready for organic light-emitting diodes

2020 ◽  
Vol 11 (1) ◽  
Author(s):  
Jiayi Li ◽  
Liding Wang ◽  
Zifeng Zhao ◽  
Boxun Sun ◽  
Ge Zhan ◽  
...  
Keyword(s):  
High Efficiency ◽  
Light Emitting Diodes ◽  
Photophysical Properties ◽  
Organic Light Emitting Diodes ◽  
Structure Property ◽  
Light Emitting ◽  
Organic Light ◽  
Structure Property Relationship ◽  
Research On Application ◽  
The Eu

Abstract Divalent europium 5d-4f transition has aroused great attention in many fields, in a way of doping Eu2+ ions into inorganic solids. However, molecular Eu2+ complexes with 5d-4f transition are thought to be too air-unstable to explore their applications. In this work, we synthesized four Eu2+-containing azacryptates EuX2-Nn (X = Br, I, n = 4, 8) and systematically studied the photophysical properties in crystalline samples and solutions. Intriguingly, the EuX2-N8 complexes exhibit near-unity photoluminescence quantum yield, good air-/thermal-stability and mechanochromic property (X = I). Furthermore, we proved the application of Eu2+ complexes in organic light-emitting diodes (OLEDs) with high efficiency and luminance. The optimized device employing EuI2-N8 as emitter has the best performance as the maximum luminance, current efficiency, and external quantum efficiency up to 25470 cd m−2, 62.4 cd A−1, and 17.7%, respectively. Our work deepens the understanding of structure-property relationship in molecular Eu2+ complexes and could inspire further research on application in OLEDs.

Efficient quasi-two dimensional perovskite light-emitting diodes using a cage-type additive

2020 ◽  
Vol 8 (29) ◽  
pp. 9845-9853
Author(s):  
Run Wang ◽  
Yue Zhang ◽  
Xing-Juan Ma ◽  
Yan-Hong Deng ◽  
Jun-Wei Shi ◽  
...  
Keyword(s):  
Current Efficiency ◽  
High Performance ◽  
Light Emitting Diodes ◽  
Hole Transport ◽  
Type Structure ◽  
Transport Layer ◽  
Hole Transport Layer ◽  
Two Dimensional ◽  
Light Emitting ◽  
Maximum Current

High performance quasi-2D PeLEDs with maximum current efficiency of 35.5 cd A−1, by introducing α-cyclodextrin (α-CD) with a cage-type structure as an additive and TFB/PVK bilayer as a hole transport layer, are demonstrated.

scholarly journals Improved Charge Injection and Transport of Light-Emitting Diodes Based on Two-Dimensional Materials

2019 ◽  
Vol 9 (19) ◽  
pp. 4140 ◽  
Author(s):  
Yuanming Zhou ◽  
Sijiong Mei ◽  
Dongwei Sun ◽  
Neng Liu ◽  
Fei Mei ◽  
...  
Keyword(s):  
High Efficiency ◽  
Light Emitting Diodes ◽  
2D Materials ◽  
Transition Metal Dichalcogenides ◽  
Chemical Properties ◽  
Two Dimensional ◽  
Effective Electron ◽  
Light Emitting ◽  
Two Dimensional Materials ◽  
Materials Used

Light-emitting diodes (LEDs) are considered to be the most promising energy-saving technology for future lighting and display. Two-dimensional (2D) materials, a class of materials comprised of monolayer or few layers of atoms (or unit cells), have attracted much attention in recent years, due to their unique physical and chemical properties. Here, we summarize the recent advances on the applications of 2D materials for improving the performance of LEDs, including organic light emitting diodes (OLEDs), quantum dot light emitting diodes (QLEDs) and perovskite light emitting diodes (PeLEDs), using organic films, quantum dots and perovskite films as emission layers (EMLs), respectively. Two dimensional materials, including graphene and its derivatives and transition metal dichalcogenides (TMDs), can be employed as interlayers and dopant in composite functional layers for high-efficiency LEDs, suggesting the extensive application in LEDs. The functions of 2D materials used in LEDs include the improved work function, effective electron blocking, suppressed exciton quenching and reduced surface roughness. The potential application of 2D materials in PeLEDs is also presented and analyzed.

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