Publication date: 22nd July 2026
Photoluminescence of metal halide perovskite semiconductors exhibits highly complex temporal dynamics under time-modulated excitation. The characteristic timescales range from nanoseconds to hours and even days, depending on the underlying photo-induced processes. Fast dynamics are governed by charge trapping, detrapping, and recombination, whereas slower dynamics originate from ion migration and defect chemistry.
I will discuss these dynamic processes across the entire range of timescales, with particular emphasis on photodoping and on halide segregation in mixed-halide perovskites. The presentation will focus on steady-state and time-resolved spectroscopic methods employing pulse bursts and even more complex excitation sequences recently developed in our laboratory.
This unusual photoluminescence response makes perovskites well suited to the definition of a memlumor—a luminophore with memory—an elementary building block for photonic information processing, including neuromorphic computing.[1] The photoluminescence quantum yield of a memlumor "remembers" the history of previous optical excitation through photo-induced changes in the parameters governing its photophysics and photochemistry. I will discuss memory effects arising from photodoping in CsPbBr₃ and related materials,[2,3] demonstrate their application to the recognition of 5-bit temporal pulse sequences,[4] and present preliminary results on controlling photo-induced halide segregation in mixed-halide perovskites using tailored excitation protocols.
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