scholarly journals High-performance quasi-2D perovskite light-emitting diodes: from materials to devices

2021 ◽  
Vol 10 (1) ◽  
Author(s):  
Li Zhang ◽  
Changjiu Sun ◽  
Tingwei He ◽  
Yuanzhi Jiang ◽  
Junli Wei ◽  
...  
Keyword(s):  
Energy Transfer ◽  
High Performance ◽  
Light Emitting Diodes ◽  
Structural Characteristics ◽  
Quantum Yields ◽  
Research Directions ◽  
Light Emitting ◽  
Perovskite Materials ◽  
Quantum Confinement Effects ◽  
Semiconducting Properties

AbstractQuasi-two-dimensional (quasi-2D) perovskites have attracted extraordinary attention due to their superior semiconducting properties and have emerged as one of the most promising materials for next-generation light-emitting diodes (LEDs). The outstanding optical properties originate from their structural characteristics. In particular, the inherent quantum-well structure endows them with a large exciton binding energy due to the strong dielectric- and quantum-confinement effects; the corresponding energy transfer among different n-value species thus results in high photoluminescence quantum yields (PLQYs), particularly at low excitation intensities. The review herein presents an overview of the inherent properties of quasi-2D perovskite materials, the corresponding energy transfer and spectral tunability methodologies for thin films, as well as their application in high-performance LEDs. We then summarize the challenges and potential research directions towards developing high-performance and stable quasi-2D PeLEDs. The review thus provides a systematic and timely summary for the community to deepen the understanding of quasi-2D perovskite materials and resulting LED devices.

scholarly journals Advances and Challenges in Two-Dimensional Organic–Inorganic Hybrid Perovskites Toward High-Performance Light-Emitting Diodes

2021 ◽  
Vol 13 (1) ◽  
Author(s):  
Miao Ren ◽  
Sheng Cao ◽  
Jialong Zhao ◽  
Bingsuo Zou ◽  
Ruosheng Zeng
Keyword(s):  
High Performance ◽  
Light Emitting Diodes ◽  
Structural Diversity ◽  
Two Dimensional ◽  
Light Emitting ◽  
Quantum Well Structures ◽  
Perovskite Materials ◽  
Energy Funnel ◽  
Recent Developments ◽  
Low Efficiency

AbstractTwo-dimensional (2D) perovskites are known as one of the most promising luminescent materials due to their structural diversity and outstanding optoelectronic properties. Compared with 3D perovskites, 2D perovskites have natural quantum well structures, large exciton binding energy (Eb) and outstanding thermal stability, which shows great potential in the next-generation displays and solid-state lighting. In this review, the fundamental structure, photophysical and electrical properties of 2D perovskite films were illustrated systematically. Based on the advantages of 2D perovskites, such as special energy funnel process, ultra-fast energy transfer, dense film and low efficiency roll-off, the remarkable achievements of 2D perovskite light-emitting diodes (PeLEDs) are summarized, and exciting challenges of 2D perovskite are also discussed. An outlook on further improving the efficiency of pure-blue PeLEDs, enhancing the operational stability of PeLEDs and reducing the toxicity to push this field forward was also provided. This review provides an overview of the recent developments of 2D perovskite materials and LED applications, and outlining challenges for achieving the high-performance devices."Image missing"

scholarly journals Highly efficient blue light-emitting diodes with tunable wavelength using vertically graded bandgap quasi-2D perovskite films

2021 ◽  
Author(s):  
Zhiyong Fan ◽  
Lei Shu ◽  
Qianpeng Zhang ◽  
Swapnadeep Poddar ◽  
Daquan Zhang ◽  
...  
Keyword(s):  
Quantum Efficiency ◽  
High Performance ◽  
Light Emitting Diodes ◽  
Synergetic Effect ◽  
Lead Chloride ◽  
High Quantum Efficiency ◽  
Light Emitting ◽  
Perovskite Materials ◽  
Tunable Wavelength ◽  
Graded Bandgap

Abstract Metal halide perovskite materials have emerged as a unique class of solution process compatible semiconductors and alluring candidates for high-performance optoelectronic applications1,2,3, especially light-emitting diodes (LEDs), owing to high quantum efficiency, facile color tunability, narrow emission line widths, as well as cost-effectiveness4,5,6. Despite of the great successes on green and red perovskite LEDs (PeLEDs), the advancement of external quantum efficiency (EQE) of blue PeLEDs still lags far behind those of green and red PeLEDs7,8. Here, we demonstrate color-tunable blue PeLEDs devices with high EQE of 16.1% and 10% for emission wavelengths of 472 nm and 461 nm, respectively. The efficient tunable wavelength electroluminescence (EL) and high (EQE) originate from the optimization of the recombination zone position to reach the charge injection balance in the vertically graded bandgap quasi-2D perovskite materials. Under the synergetic effect of lead chloride (PbCl2) doping and propane-1,3-diammonium (PDABr2) incorporation, the vertically graded bandgap perovskite materials can be prepared by the self-regulation of the reduced-dimensional perovskite during the annealing process. Our work here has significantly elevated the performance of the current blue PeLEDs. It opens up a novel avenue to fabricate high-performance blue PeLEDs that can match up the performance of the green and red PeLEDs for future lighting and display applications.

Thin Film 2-d Photonic Crystals High-Performance Light-Emitting Diodes

1999 ◽  
Author(s):  
Eli Yablonovitch ◽  
Misha Boroditsky ◽  
Rutger Vrijen ◽  
Thomas F. Krauss ◽  
Roberto Coccioli
Keyword(s):  
Thin Film ◽  
Photonic Crystals ◽  
High Performance ◽  
Light Emitting Diodes ◽  
Light Emitting

Ultra-smooth and robust graphene-based hybrid anode for high-performance flexible organic light-emitting diodes

2021 ◽  
Author(s):  
zhikun zhang ◽  
lianlian xia ◽  
Lizhao Liu ◽  
Yuwen Chen ◽  
zuozhi wang ◽  
...  
Keyword(s):  
Surface Roughness ◽  
Chemical Vapor Deposition ◽  
Vapor Deposition ◽  
High Performance ◽  
Light Emitting Diodes ◽  
Chemical Vapor ◽  
Organic Light Emitting Diodes ◽  
Light Emitting ◽  
Organic Light ◽  
Large Particles

Large surface roughness, especially caused by the large particles generated during both the transfer and the doping processes of graphene grown by chemical vapor deposition (CVD) is always a critical...

Sign in / Sign up

Export Citation Format

Share Document