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Title: Excitonic gain and laser emission from mixed-cation halide perovskite thin films

Journal Article · · Optica

Organic–inorganic halide perovskites have recently developed into a potential semiconductor coherent light emitter candidate beyond their promise in solar cell applications. However, despite the ample demonstrations of perovskite lasers, experimental results on the origin of optical gain in perovskites are still elusive. Here, we analyze the excitonic gain in the green from mixed-cation halide perovskites Cs0.17[CH(NH2)2]0.83PbBr3 (Cs0.17FA0.83PbBr3) by both low temperature absorption/emission spectroscopies and ultrafast pump–probe transient absorption experiments. The perovskite thin films show a robust excitonic feature up to room temperature, with estimated exciton binding energy Eb = 43.8 meV, which can be maintained under high electronic excitations that are required for lasers. By using a high-quality (Q = 1350) vertical cavity consisting of sputtered dielectric HfO2/SiO2 distributed Bragg reflectors with perovskite optical gain medium embedded inside, we have demonstrated excitonic-gain-enabled optically pumped lasing, with improved threshold of 13.5 ± 1.4 μJ/cm2 and device longevity lifetime >35 h (108 laser shots) at ambient environment under sustained pulsed optical excitations (3.493 eV, τpulse = 0.34 ns, 1 kHz). Understanding and exploiting excitonic gain from perovskite thin film materials may help to further boost the performance of perovskite-based lasers.

Research Organization:
Brown Univ., Providence, RI (United States)
Sponsoring Organization:
USDOE
Grant/Contract Number:
FG02-07ER46387
OSTI ID:
1471743
Alternate ID(s):
OSTI ID: 1502474
Journal Information:
Optica, Journal Name: Optica Vol. 5 Journal Issue: 9; ISSN 2334-2536
Publisher:
Optical Society of AmericaCopyright Statement
Country of Publication:
United States
Language:
English
Citation Metrics:
Cited by: 22 works
Citation information provided by
Web of Science

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Cited By (3)

Effects of External Magnetic Fields on Optical Properties of an Oxide Quantum Dot Using the Smorodinsky–Winternitz Potential journal January 2020
Deprotonation and vacancies at the CH 3 NH 3 PbI 3 /ZnO and CH 3 NH 3 PbI 3 /GaN interfaces, detected in their theoretical XANES journal January 2019
Amplified Spontaneous Emission and Lasing in Lead Halide Perovskites: State of the Art and Perspectives journal October 2019


Figures / Tables (6)


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