Chalcogenide perovskites represent a promising class of materials known for their robust stability,environmentally friendly composition,and intriguing optoelectronic characteristics.Their A-site cation is largely depe...Chalcogenide perovskites represent a promising class of materials known for their robust stability,environmentally friendly composition,and intriguing optoelectronic characteristics.Their A-site cation is largely dependent on nonmagnetic Ca,Sr,Ba elements,showing little influences on the optoelectronic properties of chalcogenide perovskites.Here,by introducing magnetic element Eu as A-site cation,we present a comprehensive investigation into the crystal structures,band characteristics,optoelectronic features,and magnetic behaviors of EuHfS_(3),targeting for photovoltaics.EuHfS_(3) adopts a distorted perovskite structure within the Pnma space group.This structure allows for various magnetic configurations,setting foundations for multiple photovoltaic effect.The conduction band maximum primarily originates from the Hf 5d orbitals,akin to SrHfS_(3).Intriguingly,the presence of Eu spin-up 4f orbitals lifts the covalence band minimum,consequently narrowing the band gap of EuHfS_(3)(1.6 eV),which is suitable for absorber layer in p-i-n junction solar cells.Moreover,zero field cooled magnetization measurements reveal antiferromagnetic behavior in EuHfS_(3),indicating further spin photovoltaic effect.The integration of magnetic properties into chalcogenide perovskites,in conjunction with their inherent semiconducting attributes,holds promise for future advancements in photovoltaics and other spintronic device technologies.展开更多
Luminescent nanothermometry can precisely and remotely measure the internal temperature of objects at nanoscale precision,which,therefore,has been placed at the forefront of scientific attention.In particular,due to t...Luminescent nanothermometry can precisely and remotely measure the internal temperature of objects at nanoscale precision,which,therefore,has been placed at the forefront of scientific attention.In particular,due to the high photochemical stability,low toxicity,rich working mechanisms,and superior thermometric performance,lanthanide-based ratiometric luminesencent thermometers are finding prevalent uses in integrated electronics and optoelectronics,property analysis of in-situ tracking,biomedical diagnosis and therapy,and wearable e-health monitoring.Despite recent progresses,it remains debate in terms of the underlying temperature-sensing mechanisms,the quantitative characterization of performance,and the reliability of temperature readouts.In this review,we show the origin of thermal response luminescence,rationalize the ratiometric scheme or thermometric mechanisms,delve into the problems in the characterization of thermometric performance,discuss the universal rules for the quantitative comparison,and showcase the cutting-edge design and emerging applications of lanthanide-based ratiometric thermometers.Finally,we cast a look at the challenges and emerging opportunities for further advances in this field.展开更多
基金supported by the National Natural Science Foundation of China(no.62104215)Department of Science and Technology of Henan Province of China(no.232102211080)+3 种基金support from the National Natural Science Foundation of China(no.12004340)support from the National Natural Science Foundation of China(no.12204420)support from the National Natural Science Foundation of China(no.11774365)support from the National Natural Science Foundation of China(no.12074347).
文摘Chalcogenide perovskites represent a promising class of materials known for their robust stability,environmentally friendly composition,and intriguing optoelectronic characteristics.Their A-site cation is largely dependent on nonmagnetic Ca,Sr,Ba elements,showing little influences on the optoelectronic properties of chalcogenide perovskites.Here,by introducing magnetic element Eu as A-site cation,we present a comprehensive investigation into the crystal structures,band characteristics,optoelectronic features,and magnetic behaviors of EuHfS_(3),targeting for photovoltaics.EuHfS_(3) adopts a distorted perovskite structure within the Pnma space group.This structure allows for various magnetic configurations,setting foundations for multiple photovoltaic effect.The conduction band maximum primarily originates from the Hf 5d orbitals,akin to SrHfS_(3).Intriguingly,the presence of Eu spin-up 4f orbitals lifts the covalence band minimum,consequently narrowing the band gap of EuHfS_(3)(1.6 eV),which is suitable for absorber layer in p-i-n junction solar cells.Moreover,zero field cooled magnetization measurements reveal antiferromagnetic behavior in EuHfS_(3),indicating further spin photovoltaic effect.The integration of magnetic properties into chalcogenide perovskites,in conjunction with their inherent semiconducting attributes,holds promise for future advancements in photovoltaics and other spintronic device technologies.
基金supported by the National Natural Science Foundation of China(Nos.12074347,61935009,and 12004346)the Science Foundation for Distinguished Young Scholars of Henan Province(No.212300410019)+1 种基金the Project funded by China Postdoctoral Science Foundation(No.2019M662508)the Young Talent Support Project of Henan Province(No.222300420322).
文摘Luminescent nanothermometry can precisely and remotely measure the internal temperature of objects at nanoscale precision,which,therefore,has been placed at the forefront of scientific attention.In particular,due to the high photochemical stability,low toxicity,rich working mechanisms,and superior thermometric performance,lanthanide-based ratiometric luminesencent thermometers are finding prevalent uses in integrated electronics and optoelectronics,property analysis of in-situ tracking,biomedical diagnosis and therapy,and wearable e-health monitoring.Despite recent progresses,it remains debate in terms of the underlying temperature-sensing mechanisms,the quantitative characterization of performance,and the reliability of temperature readouts.In this review,we show the origin of thermal response luminescence,rationalize the ratiometric scheme or thermometric mechanisms,delve into the problems in the characterization of thermometric performance,discuss the universal rules for the quantitative comparison,and showcase the cutting-edge design and emerging applications of lanthanide-based ratiometric thermometers.Finally,we cast a look at the challenges and emerging opportunities for further advances in this field.
