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Efficient nanowire lasers facilitate fiber optic communication, pollution analysis and other applications. The challenge is to find the right material. These ultra-compact nanowires have excellent luminescence, adjustable wavelengths, and are relatively easy to synthesize. These perovskite nanowires are comparable to efficient solar cell materials.
It is reported that perovskite materials have the advantages of low cost, simple process and high efficiency, and are commonly used materials for solar panel research. Now, researchers have shown that nanowire lasers made from lead-halide perovskites are the most efficient lasers known.
Two different halide nanowire lasers emit images, iodine and bromine at room temperature.
Semiconductor nanowire lasers are the preferred components for integrating nanoscale photonics and optoelectronic devices due to their ultra-compact physical structure, high coherent output and high efficiency. Moreover, the excitation requires only a small threshold, and only a small amount of light is emitted below the threshold.
In nanowire laser technology, high "laser thresholds" not only make critical technology advances difficult, but also limit laser energy to cause other energy losses. In search of the ideal nanowire laser material, researchers at Columbia University and the University of Wisconsin-Madison studied a new material, methylammonium lead halide perovskite (CH3NH3PbX3), an emerging high-efficiency solar cell. The main materials, low cost, simple process, and high efficiency.
The superior performance of lead-halide perovskites in solar cells is attributed to their long carrier lifetime and low non-radiative recombination, which are also ideal for the fabrication of semiconductor lasers.
At room temperature, these nanowire lasers have the lowest laser threshold and nearly 100% laser efficiency (the ratio of the number of photons emitted and absorbed, one laser photon can be emitted per photon), and the laser wavelength is adjustable. The characteristics of near infrared to visible light.
Laser emission from near infrared to blue light is caused by a decrease in the atomic number of the halide (X = I, Br, Cl) on the nanowire. These nanowires can drive the application of nanophotonics and optoelectronic devices. Especially in the near-infrared region, lasers can be better applied to fiber-optic communications.
