Tai Luo, Junzi Li, Yanyan Cui, Hao Jin and Tingchao He
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引用次数: 0
Abstract
Studying the fundamental optical properties of two-dimensional (2D) perovskites is a prerequisite for developing related applications. In this work, we have prepared A2PbBr4 (A = EA+, PA+, and BA+) (EA+ = ethylammonium, PA+ = propylammonium, and BA+ = butylammonium) polycrystalline thin films with different alkylamine chain lengths by a spin-coating and annealing method, and we investigate the effect of the organic spacer cation chain length on optical properties. Our experimental results show that the length of the amine chain can significantly affect the temperature-dependent photoluminescence (PL) properties. Specifically, short amine chains will result in dominance of the thermal expansion effect, while long amine chains can enhance electron–phonon coupling strength. Meanwhile, we confirm that the amine chain length can also effectively regulate the two-photon excited PL properties of 2D perovskite films. Among the three samples, the (PA)2PbBr4 film with a medium chain length exhibits the largest two-photon absorption coefficient, attributed to its large density of states and the strongest electron–phonon coupling strength. Our study not only deepens the understanding of the regulation of PL properties in 2D perovskites but also provides an important theoretical basis for the development of high-performance luminescent devices.
期刊介绍:
The Journal of Materials Chemistry is divided into three distinct sections, A, B, and C, each catering to specific applications of the materials under study:
Journal of Materials Chemistry A focuses primarily on materials intended for applications in energy and sustainability.
Journal of Materials Chemistry B specializes in materials designed for applications in biology and medicine.
Journal of Materials Chemistry C is dedicated to materials suitable for applications in optical, magnetic, and electronic devices.
Example topic areas within the scope of Journal of Materials Chemistry C are listed below. This list is neither exhaustive nor exclusive.
Bioelectronics
Conductors
Detectors
Dielectrics
Displays
Ferroelectrics
Lasers
LEDs
Lighting
Liquid crystals
Memory
Metamaterials
Multiferroics
Photonics
Photovoltaics
Semiconductors
Sensors
Single molecule conductors
Spintronics
Superconductors
Thermoelectrics
Topological insulators
Transistors