Spin-polarized lasers have been found superior to conventional lasers in many aspects of both performance and functionality. Hybrid organic-inorganic perovskites are emerging spintronic materials with great potential for advancing spin-polarized laser technology, but the rapid carrier spin relaxation process in hybrid perovskites presents a major bottleneck for spin-polarized lasing. Now, researchers at the Chinese Academy of Sciences (CAS) and Beijing Normal University have identified and successfully suppressed the spin relaxation mechanism in perovskites for the experimental realization of spin-polarized perovskite lasers.
The electron-hole exchange interaction was identified as the decisive spin relaxation mechanism hindering the realization of spin-polarized lasing in perovskite microcrystals. Consequently, an ion doping strategy was employed to introduce a new energy level in perovskites, which enables a long carrier spin lifetime by suppressing the electron-hole exchange interaction.
As a result, spin-polarized lasing was achieved in the doped perovskite microcrystals. Moreover, the team explained that the doped cation is a magnetic species allowing for the magnetic field control of the spin-polarized perovskite lasing.
This work could open the door to using perovskites for spin-polarized lasers, providing guidance for the design of perovskites towards spintronic devices.
