Nanolasers Incorporating Co x Ga 0.6– x ZnSe 0.4 Nanoparticle Arrays with Wavelength Tunability at Room Temperature

Gao

Zhao

et al. 2023

Preprint

The hot electron transfer resulting fluorescence enhancement has the significant meaningful for theory and experiment of photoelectric devices studying. However, the laser emission based on hot electron transfer directly is difficult to realize because of the low transfer efficiency. To achieve laser with new generation mechanism base on hot-electron transfer, the photo-electric co-excitation are proposed for improving the efficiency of hot electron transfer. The lasing behavior at 532 nm are realized with a threshold of 5 kw cm-2&1 μA, which can be considered as the hot e transfer lasing. For details, number of hot electrons transfer process were described via transient absorption spectrum according to the improved ground state bleaching and excited state absorption signal in device ON. Through comparing to optical pump only, the quantum efficiencies of hot electron generation (HEG) and hot electron transfer (HET) were increased by this method about 31% and 31% (about 2.2 and 3.5 times), respectively. Efficient hot electron transferring from the charge regulation of metals by adding an electric field was confirmed. Most importantly, a triple gain mode coupling device including local surface plasmon, hot-e transfer and array oscillation was presented in experiment and simulation. This study can provide theoretical and experimental reference for the research of hot electron lasers and device.

Section: Etching Cspbbr3 Qds Nanorods Arraymentioning

confidence: 96%

The hot-e lasers based on electron transfer enhanced by electric polarization under photo-electric co-excitation in perovskite and metal

Gao

Zhao

et al. 2023

Preprint

“…1a 5 ). The details of the three-beam interference optical path can be seen in our previous work [11]. After the step of development, the photoresist nanorod arrays were obtained (Fig.…”

Section: Etching Cspbbr 3 Qds Nanorods Laser Arraysmentioning

confidence: 99%

The hot-e lasers based on effectively electron transfer enhanced by electric polarization in perovskite and metal

Zhang

Zhao

et al. 2022

Preprint

Self Cite

The hot electron transfer resulting fluorescence enhancement has the significant meaningful for theory and experiment of photoelectric devices studying. However, the laser emission based on hot electron transfer directly is difficult to realize because of the low transfer efficiency. To achieve laser with new generation mechanism base on hot-electron transfer, the optical + electrical excitation simultaneously are proposed for improving the efficiency of hot electron transfer. The lasing behavior at 532 nm are realized with a threshold of 5 kw cm− 2&1 µA, which can be considered as the hot e transfer lasing. For details, number of hot electrons transfer process were described via transient absorption spectrum according to the improved ground state bleaching and excited state absorption signal in device ON. Through comparing to optical pump only, the quantum efficiencies of hot electron generation (HEG) and hot electron transfer (HET) were increased by this method about 31% and 31% (about 2.2 and 3.5 times), respectively. Efficient hot electron transferring from the charge regulation of metals by adding an electric field was confirmed. Most importantly, a triple gain mode coupling device including local surface plasmon, hot-e transfer and whispering gallery mode was presented in experiment and simulation. This study can provide theoretical and experimental reference for the research of hot electron lasers and device.

“…Perovskite materials such as CsPbBr 3 have great application prospects in the active medium of lasers due to their low density of band-to-band defects, long carrier diffusion distance, high light absorption efficiency, and high luminous efficiency. − The inorganic perovskite quantum dots (QDs) have attracted attention because of their high quantum yield, large photon absorption cross section, and regulable fluorescence wavelength and have great potential as laser gain media. − Thus, many research studies have been performed in this field. A very low threshold and stable spontaneous emission amplification optical gain characteristics of perovskites were confirmed, which exhibited a tunable laser wavelength with changes to the halogen component.…”

Section: Introductionmentioning

confidence: 99%

Ultrasimple and Ultrafast Method of Optical Modulation by Perovskite Quantum Dot Attachment to a Graphene Surface

Gao

et al. 2022

ACS Omega

Self Cite

Optical modulation is the process of modifying the structure and elemental composition of materials so that the main optical parameters, including amplitude, frequency, and phase, are changed. Currently, much research attention has been directed toward ultrafast dynamics, but the process of modulation is often complex. To simplify the optical modulation process and improve the optical properties of perovskites for semiconductor quantum dot (QD) lasers, the process and physical mechanism underlying graphene QD ultrafast modulation of the optical properties of perovskite CsPbBr 3 QDs were investigated. The typical cubic structure and square shape of CsPbBr 3 QDs were characterized by transmission electron microscopy and X-ray diffraction, respectively. A luminescent peak centered near 540 nm and Stokes shift of 21.34 nm of CsPbBr 3 QDs without graphene QDs were measured by absorption and photoluminescence spectroscopy. A maximum modulation shift of 133 nm and a modulation depth of 900% were achieved in CsPbBr 3 with graphene. The results indicated that graphene QDs had the best modulation effect on perovskites when the drop volume was 0.05 mL. The process of ultrafast optical modulation via graphene QDs occurring within 1 ps was confirmed by the transient absorption spectrum. The modulation mechanism of graphene to perovskites is presented for guidance. This paper can be used as a reference for the optical modulation of perovskite materials.