Single- and two-photon excited photoluminescence of 2D perovskite thin films with different organic spacer cations†

IF 5.7 2区 材料科学 Q2 MATERIALS SCIENCE, MULTIDISCIPLINARY
Tai Luo, Junzi Li, Yanyan Cui, Hao Jin and Tingchao He
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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.

Abstract Image

含不同有机间隔阳离子的二维过氧化物薄膜的单光子和双光子激发光致发光
研究二维(2D)包晶石的基本光学特性是开发相关应用的先决条件。在这项工作中,我们采用旋涂退火法制备了不同烷基胺链长的 A2PbBr4(A = EA+、PA+ 和 BA+)(EA+ = 乙铵,PA+ = 丙铵,BA+ = 丁铵)多晶薄膜,并研究了有机间隔阳离子链长对光学性质的影响。实验结果表明,胺链的长度会显著影响随温度变化的光致发光(PL)特性。具体来说,短胺链会导致热膨胀效应占主导地位,而长胺链则会增强电子-声子耦合强度。同时,我们证实胺链长度也能有效调节二维包晶薄膜的双光子激发聚光特性。在三种样品中,中等链长的 (PA)2PbBr4 薄膜表现出最大的双光子吸收系数,这归因于其较大的态密度和最强的电子-光子耦合强度。我们的研究不仅加深了对二维过氧化物中聚光特性调控的理解,而且为开发高性能发光器件提供了重要的理论依据。
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来源期刊
Journal of Materials Chemistry C
Journal of Materials Chemistry C MATERIALS SCIENCE, MULTIDISCIPLINARY-PHYSICS, APPLIED
CiteScore
10.80
自引率
6.20%
发文量
1468
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
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