Efficient Energy Funneling in Quasi-2D Perovskites: From Light Emission to Lasing |
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Authors: | Lei Lei Dovletgeldi Seyitliyev Samuel Stuard Juliana Mendes Qi Dong Xiangyu Fu Yi-An Chen Siliang He Xueping Yi Liping Zhu Chih-Hao Chang Harald Ade Kenan Gundogdu Franky So |
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Affiliation: | 1. Department of Materials Science and Engineering, Organic and Carbon Electronics Lab (ORaCEL), North Carolina State University, Raleigh, NC, 27695 USA;2. Department of Physics, Organic and Carbon Electronics Lab (ORaCEL), North Carolina State University, Raleigh, NC, 27695 USA;3. Department of Mechanical and Aerospace Engineering, North Carolina State University, Raleigh, NC, 27695 USA |
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Abstract: | Quasi-2D Ruddlesden–Popper halide perovskites with a large exciton binding energy, self-assembled quantum wells, and high quantum yield draw attention for optoelectronic device applications. Thin films of these quasi-2D perovskites consist of a mixture of domains having different dimensionality, allowing energy funneling from lower-dimensional nanosheets (high-bandgap domains) to 3D nanocrystals (low-bandgap domains). High-quality quasi-2D perovskite (PEA)2(FA)3Pb4Br13 films are fabricated by solution engineering. Grazing-incidence wide-angle X-ray scattering measurements are conducted to study the crystal orientation, and transient absorption spectroscopy measurements are conducted to study the charge-carrier dynamics. These data show that highly oriented 2D crystal films have a faster energy transfer from the high-bandgap domains to the low-bandgap domains (<0.5 ps) compared to the randomly oriented films. High-performance light-emitting diodes can be realized with these highly oriented 2D films. Finally, amplified spontaneous emission with a low threshold 4.16 µJ cm−2 is achieved and distributed feedback lasers are also demonstrated. These results show that it is important to control the morphology of the quasi-2D films to achieve efficient energy transfer, which is a critical requirement for light-emitting devices. |
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Keywords: | amplified spontaneous emission distributed-feedback lasers energy funneling light-emitting diodes quasi-2D perovskites |
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