Keldysh tuning of photoluminescence in a lead halide perovskite crystal

• 成果类型: Article
• 署名作者: Zhang, Zhuquan; Ning, Honglie; Liu, Zi-Jie; Hou, Jin; Mohite, Aditya D.; Baldini, Edoardo; Gedik, Nuh; Nelson, Keith A.
• 署名单位: Massachusetts Institute of Technology (MIT); Massachusetts Institute of Technology (MIT); Rice University; Rice University; University of Texas System; University of Texas Austin
• 刊物名称: PROCEEDINGS OF THE NATIONAL ACADEMY OF SCIENCES OF THE UNITED STATES OF AMERICA
• ISSN/ISSBN: 0027-9607
• DOI: 10.1073/pnas.2426253122
• 发表日期: 2025-08-19
• 关键词: optoelectronic applications; field; DYNAMICS

摘要

In 1964, Keldysh laid the groundwork for strong-field physics in atomic, molecular, and solid-state systems by delineating a ubiquitous transition from multiphoton absorption to classical field-driven electron tunneling under intense electromagnetic waves. While both processes in semiconductors can generate carriers and result photon emission through electron-hole recombination, the low quantum yields most materials have hindered direct observation of the Keldysh crossover. Leveraging the large quantum yields of photoluminescence in lead halide perovskites, we show that we can not only induce bright light emission from extreme subbandgap excitation but also distinguish between photon-induced and electric-field-induced processes. Our results span the transition between quantum-mechanical and classical field effects the light and provide generalizable insights into the nonequilibrium dynamics that result from strong-field light-matter interactions. The findings also open avenues for light upconversion and subbandgap photon detection, highlighting the potential lead halide perovskites in advanced optoelectronic applications.