Capturing the fleeting transformation of perovskite nanomaterials under light
IBS CMSD visualizes real-time changes in light-sensitive nanomaterials, opening new frontiers in advanced materials research and analysis
2025-06-12
(Press-News.org)
A team at the Institute for Basic Science (IBS) Center for Molecular Spectroscopy and Dynamics (CMSD) — led by Director CHO Minhaeng (Professor of Chemistry, Korea University) and Professor YOON Tai Hyun (Department of Physics, Korea University) — has developed a powerful new spectroscopic technique that enables real-time tracking of how perovskite nanomaterials change under light.
The technique, called asynchronous and interferometric transient absorption spectroscopy (AI-TA), provides ultrafast measurements of excited-state dynamics and structural transformations in light-responsive materials. It overcomes major limitations of traditional ultrafast spectroscopy, which often requires long data acquisition times and can damage light-sensitive samples during measurement.
“We can now simultaneously observe not just how a material reacts to light but also how it transforms during the reaction itself,” explained Director CHO Minhaeng. “This makes AI-TA a powerful tool for real-time analysis of complex nanoscale processes.”
Perovskite materials are considered promising candidates for next-generation optoelectronic devices like solar cells and LEDs. Conventional femtosecond (10⁻¹⁵ second) laser-based techniques allow for ultrafast observation of their carrier dynamics, reflecting chemical and physical properties. However, such properties are highly sensitive to external factors, such as light, making it difficult to study how they behave in real-world conditions. Especially for ultrafast spectroscopy, the laser pulses used for observation can degrade or alter the sample.
The IBS team addressed this challenge by dramatically shortening measurement time using AI-TA, which relies on two precisely synchronized lasers to capture spectrally and temporally resolved snapshots of the material's transient state. With this technique, the IBS researchers could observe phenomena — including charge carrier dynamics, compositional shifts, and structural reorganizations — over broad timescales ranging from femtoseconds to several minutes.
“AI-TA is evolving into a time-resolved spectroscopic technique that leverages the precision of optical frequency comb technology to investigate molecular reactions in the femtosecond regime,” added Professor YOON Tai Hyun, co-corresponding author of the study.
The researchers applied AI-TA to two types of perovskite systems. In the first, they studied light-induced halide substitution in cesium lead halide nanocrystals, showing that increasing the chloride-to-bromide ratio led to higher bandgap energies and faster charge-carrier dynamics. In the second, they investigated light-driven transformation and agglomeration of colloidal perovskite nanoplatelets, observing how energy loss in hot carriers changed depending on agglomeration, and revealing a nuanced relationship between optical behavior and structural evolution.
“AI-TA offers a new way to study the dynamics of novel materials and various chemical substances that can be easily altered by light and other factors,” said Dr. HAN Gi Rim, first author of the study. “This experiment marks the first step in showcasing the potential of AI-TA, and we look forward to expanding its applications in future research.”
This research represents a technological leap in capturing the real-time evolution of light-sensitive materials during laser measurements. Beyond perovskites, the AI-TA method has the potential to accelerate discoveries in fields ranging from quantum materials and catalysis to next-generation optoelectronic and photonic systems.
END
ELSE PRESS RELEASES FROM THIS DATE:
2025-06-12
Turin, Italy — 12 June 2025 — Eighteen UN entities joined forces today during the 2nd UN Virtual Worlds Day to urge governments, civil society, academia, and the private sector to harness the transformative potential of AI-powered virtual worlds to drive development that works for all.
The call-to-action outlines 12 priorities—from expanding connectivity to promoting responsible use of emerging technologies—in order to ensure that no one is left behind in the fast-evolving digital era.
The two-day global forum brought together leaders, innovators, and youth changemakers from around the world to spotlight how emerging technologies—from ...
2025-06-12
A combination therapy that adds a recently approved drug to the current standard of care for newly diagnosed acute myeloid leukemia (AML) showed high rates of complete remission in an early-phase clinical trial conducted at UNC Lineberger Comprehensive Cancer Center and 11 other sites nationwide.
The trial findings will be published in the Journal of Clinical Oncology (JCO) and presented at the European Hematology Association Congress in Milan, Italy, both on June 12. Joshua F. Zeidner, MD, associate professor of medicine ...
2025-06-12
According to a new study, presented at the American College of Cardiology (ACC) Care of the Athletic Heart 2025 conference, sleep apnea may be more prevalent in younger female athletes than previously believed, especially among female athletes with higher levels of training. While obstructive sleep apnea has been observed in younger male athletes, the prevalence in female athletes and the association with cardiovascular risk is largely unknown.
Obstructive sleep apnea (OSA) is the most common sleep-related breathing disorder, impacting about 18 million Americans, and is prevalent in both men and women. It occurs when the throat muscles relax and ...
2025-06-12
From counting sheep to white noise and weighted blankets, people have tried innumerable ways to get a good night’s sleep. Sleep disruptions can have far-reaching negative consequences, impacting cardiovascular and metabolic health, memory, learning, productivity, mood regulation, interpersonal relationships and more.
It turns out that an important tool for improving sleep quality may have been hiding in plain sight…in the produce aisle. A new study led by researchers at the University of Chicago Medicine and Columbia University found that eating more fruits and vegetables during the day was associated with sleeping more soundly later that same ...
2025-06-12
A clinical trial led by researchers at The Ottawa Hospital and the University of Ottawa and published in the New England Journal of Medicine illustrates a powerful and efficient approach for comparing different standard treatments. The FLUID trial compared two intravenous fluids that have been commonly used for decades in hospitalized patients: normal saline and Ringer's lactate. Many millions of litres of these fluids are used every year in Canada alone, and there is no strong evidence favouring one over the other across the hospital.
Unlike a traditional trial, which would randomly assign each patient ...
2025-06-12
In a study publishing June 12 in the Cell Press journal Cell Reports Sustainability, researchers conducted the most comprehensive analysis to date on lithium supply and demand in China, Europe, and the USA. Despite that domestic lithium production in some of these regions could grow as much as 10 times by 2030, it would still fall short of the soaring demand for electric vehicles (EVs) without expanding imports or technological innovation.
“Lithium today is as important as gasoline in the industrial revolution,” says author Qifan Xia of East China Normal University in Shanghai. “While lithium reserves are substantial around the world, they are distributed ...
2025-06-12
Your breath is one of a kind. A study published June 12 in the Cell Press journal Current Biology demonstrated that scientists can identify individuals based solely on their breathing patterns with 96.8% accuracy. These nasal respiratory “fingerprints” also offer insights into physical and mental health.
The research stemmed from the lab’s interest in olfaction, or the sense of smell. In mammals, the brain processes odor information during inhalation. This link between the brain and breathing led researchers to wonder: since every brain is unique, wouldn’t ...
2025-06-12
The population across developed countries is getting older and the associated frailty and debilitation are becoming major health problems. This gradual muscle loss is accelerated by the poor capacity to repair damage and injury, especially after falls or surgeries.
Low muscle mass in the elderly — known as sarcopenia — leads to increased frailty and movement problems. Patients with sarcopenia are more likely to be hospitalized and develop other comorbidities, largely due to falls and fractures that tend to create health declines that quickly spiral out of control.
“We knew that a major contributor is the muscle stem cells that are needed to repair ...
2025-06-12
All of us produce a growth factor – called IL-15 – which effectively protects us from cancers. It’s role is to boost the production of immune cells that can rapidly detect and kill cancer cells when they first appear. One of these cell-types is appropriately called Natural Killer Cells.
The problem is that cancer cells evolve numerous strategies to suppress immune cells like NK cells, even when these cancer cell are producing the immune boosting factor IL-15, and too often the cancer cells win. ...
2025-06-12
Gland, Switzerland (IUCN) –Experts from the International Union for Conservation of Nature (IUCN) have analysed how targeted management of invasive alien species (IAS) can reduce extinction risks for threatened species across the European Union (EU), in line with the EU Biodiversity Strategy for 2030.
Published in the open-access journal NeoBiota, and funded by the European Commission, a new study identifies where and how targeted action against IAS (species that have been introduced to areas outside their ...
LAST 30 PRESS RELEASES:
[Press-News.org] Capturing the fleeting transformation of perovskite nanomaterials under light
IBS CMSD visualizes real-time changes in light-sensitive nanomaterials, opening new frontiers in advanced materials research and analysis
