Bandgap-Engineered CsPbBr3x I3-3x Alloy Nanowires for Broadly Tunable Nanoscale Lasers

作者：Fan, Jie; Guo, Pengfei^*; Lv, Qihang; Shen, Xia^*; Song, Xiaohang; Meng, You; Xu, Zitong; Wang, Jishen; Xu, Tingkai; Li, Xuyang; Xiao, Liantuan; Ho, Johnny C.

来源：ACS Applied Nano Materials, 2023, 6(19): 17881-17889.

DOI：10.1021/acsanm.3c03173

• perovskite nanowires
• anion exchange process
• one-step chemical vapor deposition
• bandgap modulation
• tunable laser

Halide perovskite nanowires (NWs) have excellent photoelectric properties, such as high quantum efficiency and carrier mobility, and are ideal candidates for next-generation optoelectronic devices and circuits. In particular, all-inorganic perovskite materials have a soft and dynamic crystal lattice, tunable bandgaps, better thermal stability, etc., which make them ideal candidates for wavelength-tunable emitters and full-color displays. Here, we reported an anion exchange method to synthesize bandgap-modulated CsPbBr3xI3-3x alloy NWs on SiO2/Si substrate. These NWs have smooth end surfaces and exhibit NW lasing with a threshold of 18.09 mu J cm(-2) and a high-quality factor of 633-1075. Moreover, under a 355 nm pulse laser illumination, room-temperature wavelength continuous tunable lasing ranging from 538 to 699 nm is realized using these bandgap-tunable perovskite NWs. The growth strategies of these bandgap-graded structures may offer an interesting system for enriching the synthesis methods of alloy perovskites and exploring applications in multifunctional nanophotonic and optoelectronic devices.