Blue perovskite single-mode lasing in a rubidium lead bromide microcubic cavity

Abstract

Lead halide perovskite microlasers have shown impressive performance in the green and red wavebands. However, there has been limited progress in achieving blue-emitting perovskite microlasers. Here, blue-emitting perovskite-phase rubidium lead bromide (RbPbBr3) microcubes were successfully prepared by using a one-step chemical vapor deposition process, which can be utilized to construct optically pumped whispering gallery mode microlasers. By regulating the growth temperature, we found that a high-temperature environment can facilitate the formation of the perovskite phase and microcubic morphology of RbPbBr3. Notably, blue single-mode lasing in a RbPbBr3 microcubic cavity with a narrow linewidth of 0.21 nm and a high-quality factor (∼2200) was achieved. The obtained lasing from RbPbBr3 microlasers also exhibited an excellent polarization state factor (∼0.77). By modulating the mixed-monovalent cation composition, the wavelength of the microlaser could be tuned from green (536 nm) to pure blue (468 nm). Additionally, the heat stability of the mix-cation perovskite was better than that of conventional CsPbBr3. The stable and high-performance blue single-mode microlasers may thus facilitate the application of perovskite lasers in blue laser fields.

Speckle-Free Imaging Based on a Quasi-2D Perovskite Random Laser with a Subwavelength Thickness

“…Lead halide perovskites have emerged as promising optoelectronic materials owing to their attractive properties, − which have been widely used in solar cells, light-emitting diodes (LEDs), lasers, and photodetectors. − Among the perovskite family, quasi-2D perovskites have been investigated as a popular material for optoelectronic devices due to their quantum confinement effect, large exciton binding energy, and enhanced stability owing to their natural quantum-well structures. , Quasi-2D Ruddlesden–Popper (R-P) perovskites have been demonstrated as a class of natural quantum well materials, represented by the general formula of L 2 A n –1 B n X 3 n +1 . Here, L is a long chain cation, such as phenylethylammonium (PEA) and naphthylmethylamine (NMA); A is a monovalent cation, such as methylammonium (MA), formamidinium (FA), or cesium (Cs); B is a divalent metal cation, such as Pb; X is a halide anion (Cl/Br/I); and n is the number of inorganic BX 6 4– octahedral sheets between two spacer layers .…”

Dynamic Physical Unclonable Function Relying on Lasing Polarization

“…The multidimensional information encryption of thermal response circularly polarized laser arrays was realized by using wavelength and polarization state as cryptographic primitives . In addition, perovskite − microsphere lasing is often based on the whispering gallery mode (WGM), which confines light to a tiny volume, providing a high-quality factor and low threshold, and has been applied in PUFs. ,− The WGM cavity’s lasing mode is highly sensitive to the microcavity’s geometry owing to its total internal reflection; thus, by varying the microcavity’s boundary, multiple lasing signals can be generated. ,,, The destruction of the micronanostructure symmetry generates degenerate detuning of the WGM cavity, which results in linear polarization characteristics and the mode shift of lasing. ,− These phenomena contribute to unpredictable and arbitrary spectra at any polarization angle and may be promising candidates to realize dynamic PUF and break through the bottleneck of the current dynamic PUFs.…”

Photostable Cs0.5Rb0.5PbBr3 Quantum Dots for Whispering Gallery Mode Lasing

“…30,31 Li et al explored the single mode lasing in a RbPbBr 3 microcubic cavity exhibiting a high Q-factor (∼2200). 32 Although Rb substitution in CsPbX 3 (X= Cl, Br, I) lattice has been explored for various optoelectronic applications, [29][30][31]33 work on its WGM lasing characteristics is scarce and yet to be explored.…”

“…The quantum yield (QY) was reported to improve from 5.7% to 13% through optimization . Rb substitution in inorganic perovskites leads to enhanced optical properties for blue LEDs and better stability for solar cell applications. , Li et al explored the single mode lasing in a RbPbBr 3 microcubic cavity exhibiting a high Q -factor (∼2200) . Although Rb substitution in CsPbX 3 (X= Cl, Br, I) lattice has been explored for various optoelectronic applications, − , work on its WGM lasing characteristics is scarce and yet to be explored.…”