Search for dissertations about: "Feng Liu"

Showing result 1 - 5 of 32 swedish dissertations containing the words Feng Liu.

2. 1. Bandgap Engineering of Lead-Free Halide Double Perovskites

   Author : Fuxiang Ji; Feng Gao; Feng Wang; Niclas Solin; David Mitzi; Linköpings universitet; []
   Keywords : NATURVETENSKAP; NATURAL SCIENCES; NATURVETENSKAP; NATURAL SCIENCES; Lead-free halide double perovskites; Metal doping alloying; Bandgap engineering; Atomic-level structure; Thermochromism;

   Abstract : Lead-free halide double perovskites (HDPs, A2BIBIIIX6) with attractive optical and electronic features are regarded as one of the most promising alternatives to overcome the toxicity and stability issues of lead halide perovskites. They provide a wide range of possible combinations and rich substitutional chemistry with interesting properties for various optoelectronic devices. READ MORE

4. 2. High-Quality Perovskite Films for Efficient and Stable Light-Emitting Diodes

   Author : Heyong Wang; Feng Gao; Olle Inganäs; Xiaoke Liu; Ifor David William Samuel; Linköpings universitet; []
   Keywords : NATURVETENSKAP; NATURAL SCIENCES; perovskite light-emitting diodes; efficiency; stability; growth process; ion migration;

   Abstract : Metal halide perovskites have attracted significant attention for light-emitting applications, because of their excellent properties, such as high photoluminescence quantum yields (PLQYs), good charge mobility, narrow emission bandwidth, readily tunable emission spectra ranging from ultraviolet to near-infrared, and solution processability. Since the first room-temperature perovskite-based light-emitting diodes (PeLEDs) reported in 2014, tremendous efforts have been made to promote the efficiencies of PeLEDs, including theoretical simulation, materials design, and device engineering. READ MORE

5. 3. Color Tuning for Perovskite Light-Emitting Diodes

   Author : Hongling Yu; Feng Gao; Xiaoke Liu; Olle Inganäs; Fengling Zhang; Maksym V. Kovalenko; Linköpings universitet; []
   Keywords : NATURVETENSKAP; NATURAL SCIENCES; Perovskite light-emitting diodes; Color tuning; Pure and mixed halide; Spectral stability; White emission;

   Abstract : Metal halide perovskites (MHPs) are recognized as promising semiconductor materials for a variety of optical and electrical device applications due to their cost-effective and outstanding optoelectronic properties. As one of the most significant applications, perovskite light-emitting diodes (PeLEDs) hold promise for future lighting and display technologies, attributed to their high photoluminescence quantum yield (PLQY), high color purity, and tunable emission color. READ MORE

6. 4. Acoustical Characteristics of Aircraft Panels

   Author : Bilong Liu; Leping Feng; Jie Pan; KTH; []
   Keywords : TEKNIK OCH TEKNOLOGIER; ENGINEERING AND TECHNOLOGY; Acoustics; sound transmission loss; stiffener; stiffening; aircraft panel; cylindrical shell; turbulent boundary layer; TBL; noise; sound radiation; Acoustics; Akustik;

   Abstract : A deterministic approach based on a modal expansion and modal receptance method has been developed to evaluate the airborne sound insulation of aircraft panels with stringer and ring frame attachments. Furthermore, this method was extended to predict the noise radiation of stiffening panel subjected to TBL excitation. READ MORE

7. 5. Design of soundproof panels via metamaterial concept

   Author : Zibo Liu; Leping Feng; Romain Rumpler; KTH; []
   Keywords : TEKNIK OCH TEKNOLOGIER; ENGINEERING AND TECHNOLOGY;

   Abstract : The goal of the work is to find a way to improve the sound insulation properties of different types of panels in order to meet different requirements. Inspired by the nontrivial behavior of the locally resonant acoustic metamaterials, this concept is introduced into the design of structures in order to explore the potential ways to improve the sound insulation behavior in the relevant specific frequency regions. READ MORE