Development of on-chip coherent light sources with desired single-mode operation and straightforward spectral tunability has attracted intense interest due to ever-increasing demand for photonic devices and optoelectr...Development of on-chip coherent light sources with desired single-mode operation and straightforward spectral tunability has attracted intense interest due to ever-increasing demand for photonic devices and optoelectronic integration,but still faces serious challenges.Herein,we propose a facile method to synthesize cesium lead halide(CsPbX3)microstructures with well-defined morphologies,sizes,and constituent element gradient.The scheme is conducted using a chemical vapor deposition(CVD),which is subsequently associated with annealing-assisted solid-solid anion exchange.For the plate-shaped structures,the controllability on the cross-sectional dimension enables to precisely modulate the lasing modes,thus achieving single-mode operation;while tuning the stoichiometric of the halogen anion components in the plate-shaped CsPbI_(x)Br_(3−x) alloy samples,the lasing wavelengths are straightforwardly varied to span the entire visible spectrum.By comparison,the experimental scheme on synthesizing alloyed CsPbI_(x)Br_(3−x) perovskites is conducted using an in-situ approach,thereby achieving precise modulation of bandgap-controlled microlasers by controlling the reaction time.Such laser properties like controllable microcavity modes and broad stoichiometry-dependent tunability of light-emitting/lasing colors,associated with the facile synthesizing method of monocrystalline CsPbI_(x)Br_(3−x) structures,make lead halide perovskites ideal materials for the development of wavelength-controlled microlasers toward practical photonic integration.展开更多
The achievement of electrically pumped lasers with smaller and more compact physical dimensions is expected to be crucial for future optical information processing,optical storage,and photonic integrated circuits.Howe...The achievement of electrically pumped lasers with smaller and more compact physical dimensions is expected to be crucial for future optical information processing,optical storage,and photonic integrated circuits.However,developing laser devices upon electrical injection remains challenging due to stability issues,significant non-radiative losses,and severe Joule heating effects.Herein,we exhibit an ultralow-threshold low-dimensional perovskite microlaser coated with Au nanoparticles(AuNPs),which enables the optimization of its lasing properties upon optical pumping synchronized with current injection at ambient temperature.The threshold value is considerably reduced to 8.6μJ/cm^(2),which is approximately 44%lower than that of the pristine one.The microlaser incorporates size-optimized AuNPs that simultaneously enhance perovskite's lasing performance and electrical properties,particularly enabling a current injection of approximately 2.98 kA/cm^(2).Besides,AuNPs can accelerate hot-carrier cooling in perovskites,thereby reducing non-radiative recombination losses and mitigating Joule heating effects.The microlaser thresholds show progressive reduction with increasing electrical assist fraction.This study underscores that the ultimate goal of realizing electrically driven perovskite microlasers may eventually become a reality,paving a promising avenue toward the further development of electrically pumped microlaser diodes.展开更多
基金supported by the National Natural Science Foundation of China(No.12374257)。
文摘Development of on-chip coherent light sources with desired single-mode operation and straightforward spectral tunability has attracted intense interest due to ever-increasing demand for photonic devices and optoelectronic integration,but still faces serious challenges.Herein,we propose a facile method to synthesize cesium lead halide(CsPbX3)microstructures with well-defined morphologies,sizes,and constituent element gradient.The scheme is conducted using a chemical vapor deposition(CVD),which is subsequently associated with annealing-assisted solid-solid anion exchange.For the plate-shaped structures,the controllability on the cross-sectional dimension enables to precisely modulate the lasing modes,thus achieving single-mode operation;while tuning the stoichiometric of the halogen anion components in the plate-shaped CsPbI_(x)Br_(3−x) alloy samples,the lasing wavelengths are straightforwardly varied to span the entire visible spectrum.By comparison,the experimental scheme on synthesizing alloyed CsPbI_(x)Br_(3−x) perovskites is conducted using an in-situ approach,thereby achieving precise modulation of bandgap-controlled microlasers by controlling the reaction time.Such laser properties like controllable microcavity modes and broad stoichiometry-dependent tunability of light-emitting/lasing colors,associated with the facile synthesizing method of monocrystalline CsPbI_(x)Br_(3−x) structures,make lead halide perovskites ideal materials for the development of wavelength-controlled microlasers toward practical photonic integration.
基金supported by the National Natural Science Foundation of China (12374257)the Outstanding Doctoral Dis-sertation in Nanjing University of Aeronautics and Astronautics (BCXJ23-15)+1 种基金the Interdisciplinary Innovation Fund for Doctoral Students of Nanjing University of Aeronautics and Astronautics (KXKCXJJ202406)the Postgraduate Research&Practice Innovation Program of Jiangsu Province (KYCX25_0638)。
文摘The achievement of electrically pumped lasers with smaller and more compact physical dimensions is expected to be crucial for future optical information processing,optical storage,and photonic integrated circuits.However,developing laser devices upon electrical injection remains challenging due to stability issues,significant non-radiative losses,and severe Joule heating effects.Herein,we exhibit an ultralow-threshold low-dimensional perovskite microlaser coated with Au nanoparticles(AuNPs),which enables the optimization of its lasing properties upon optical pumping synchronized with current injection at ambient temperature.The threshold value is considerably reduced to 8.6μJ/cm^(2),which is approximately 44%lower than that of the pristine one.The microlaser incorporates size-optimized AuNPs that simultaneously enhance perovskite's lasing performance and electrical properties,particularly enabling a current injection of approximately 2.98 kA/cm^(2).Besides,AuNPs can accelerate hot-carrier cooling in perovskites,thereby reducing non-radiative recombination losses and mitigating Joule heating effects.The microlaser thresholds show progressive reduction with increasing electrical assist fraction.This study underscores that the ultimate goal of realizing electrically driven perovskite microlasers may eventually become a reality,paving a promising avenue toward the further development of electrically pumped microlaser diodes.
