A5035034326- Perovskite Materials and Applications
- Quantum Dots Synthesis And Properties
- Organic Light-Emitting Diodes Research
- Light effects on plants
- Greenhouse Technology and Climate Control
- Biomedical and Engineering Education
- Electrowetting and Microfluidic Technologies
- 2D Materials and Applications
- Solid State Laser Technologies
- Optical measurement and interference techniques
- Surface Roughness and Optical Measurements
- Chalcogenide Semiconductor Thin Films
- Polyoxometalates: Synthesis and Applications
- Solid-state spectroscopy and crystallography
- Advanced Optical Imaging Technologies
- Flowering Plant Growth and Cultivation
- Microfluidic and Bio-sensing Technologies
Linköping University
2020-2024
ORCID
2020
Uppsala University
2017
Abstract Bright and efficient blue emission is key to further development of metal halide perovskite light-emitting diodes. Although modifying bromide/chloride composition straightforward achieve emission, practical implementation this strategy has been challenging due poor colour stability severe photoluminescence quenching. Both detrimental effects become increasingly prominent in perovskites with the high chloride content needed produce emission. Here, we solve these critical challenges...
Compositional heterogeneity is commonly observed in mixed bromide/iodide perovskite photoabsorbers, typically with minimal effects on charge carrier recombination and photovoltaic performance. Consistently, it has so far received very limited attention bromide/chloride-mixed perovskites, which hold particular significance for blue light-emitting diodes. Here, we uncover that even a minor degree of localized halide leads to severe non-radiative losses bromide/chloride emitters, presenting...
<h2>Summary</h2> One of the most critical challenges in perovskite light-emitting diodes (PeLEDs) lies poor operational stability. Although field-dependent ion migration is believed to play an important role operation optoelectronic devices, a complete understanding how it affects stability PeLEDs still missing. Here, we report unique self-repairing behavior that electroluminescence moderately degraded can almost completely restore their initial performance after resting. We find accumulated...
Bandgap tuning through mixing halide anions is one of the most attractive features for metal perovskites. However, mixed perovskites usually suffer from phase segregation under electrical biases. Herein, we obtain high-performance and color-stable blue perovskite LEDs (PeLEDs) based on bromide/chloride three-dimensional (3D) structures. We demonstrate that color instability CsPb(Br1–xClx)3 PeLEDs results surface defects at grain boundaries. By effective defect passivation, achieve...
The threshold carrier density, conventionally evaluated from optical pumping, is a key reference parameter towards electrically pumped lasers with the widely acknowledged assumption that optically excited charge carriers relax to band edge through an ultrafast process. However, characteristically slow cooling in perovskites challenges this assumption. Here, we investigate pumping of state-of-the-art bromide- and iodine-based perovskites. We find decreases by one order magnitude decreasing...
Although perovskite light-emitting diodes (PeLEDs) have seen unprecedented development in device efficiency over the past decade, they suffer significantly from poor operational stability. This is especially true for blue PeLEDs, whose lifetime remains orders of magnitude behind their green and red counterparts. Here, we systematically investigate this efficiency-stability discrepancy a series green- to blue-emitting PeLEDs based on mixed Br/Cl-perovskites. We find that chloride...
An effective method is proposed that enables one to simultaneously analyze details of numerous holographic grating patterns over a large area. Unlike the conventional approaches relying on sophisticated lighting and optical systems dark environment, only flatbed scanner needed. Thanks "rotate-scan" measurement strategy, can be obtained, e.g., spatial distribution patterns, interval orientation grooves within each pattern, defects patterns. The has been verified by applications two papers...
Abstract Bright and efficient blue emission is key to further development of metal halide perovskite light-emitting diodes. Although modifying bromide/chloride composition straightforward achieve emission, practical implementation this strategy has been challenging due poor colour stability severe photoluminescence quenching. Both detrimental effects become increasingly prominent in perovskites with the high chloride content that desired produce emission. Here, we solve these critical...