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Efficient Energy funneling in hybrid quasi-2D perovskites: from light emitting diodes to lasers (Conference Presentation)
Author(s): Lei Lei; Dovletgeldi Seyitliyev; Xiangyu Fu; Samual Stuard; Yi-An Chen; Juliana Mendes; Qi Dong; Xueping Yi; Liping Zhu; Harald Ade; Chih-Hao Chang; Kenan Gundogdu; Franky So

Paper 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 (narrower bandgap domains) to three-dimensional nanocrystals (wide bandgap domains). Here, the quality of quasi-2D perovskite (PEA)2(FA)3Pb4Br13 is controlled by solution engineering. Grazing-incidence wide-angle X-ray scattering (GIWAXS) measurements were conducted to study the crystal orientation, and transient absorption spectroscopy (TAS) measurements were conducted to study the charge carrier dynamics. Our data show that the highly oriented 2D crystals have a faster energy transfer to the low bandgap regime (< 0.5 ps) compared to less oriented films. High-performance LEDs can be realized with these 2D films. Finally, amplified spontaneous emission is achieved with an ultralow threshold of 4.16 μJ/cm2 and distributed feedback lasers are realized. Our results show that it is important to control the morphology and spatial domain distribution of the quasi-2D films to achieve efficient energy transfer, which is a critical requirement for optoelectronic devices.

Paper Details

Date Published: 10 September 2019
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Proc. SPIE 11093, Organic and Hybrid Light Emitting Materials and Devices XXIII, 110931G (10 September 2019); doi: 10.1117/12.2541745
Show Author Affiliations
Lei Lei, North Carolina State Univ. (United States)
Dovletgeldi Seyitliyev, North Carolina State Univ. (United States)
Xiangyu Fu, North Carolina State Univ. (United States)
Samual Stuard, North Carolina State Univ. (United States)
Yi-An Chen, North Carolina State Univ. (United States)
Juliana Mendes, North Carolina State Univ. (United States)
Qi Dong, North Carolina State Univ. (United States)
Xueping Yi, North Carolina State Univ. (United States)
Liping Zhu, North Carolina State Univ. (United States)
Harald Ade, North Carolina State Univ. (United States)
Chih-Hao Chang, North Carolina State Univ. (United States)
Kenan Gundogdu, North Carolina State Univ. (United States)
Franky So, North Carolina State Univ. (United States)


Published in SPIE Proceedings Vol. 11093:
Organic and Hybrid Light Emitting Materials and Devices XXIII
Chihaya Adachi; Jang-Joo Kim; Franky So, Editor(s)

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