Spin LED (IMAGE) University of Utah Caption The first layer is a semitransparent anode, such as ITO, that injects unpolarized "holes," a quantum feature of electrons, with a certain spin. The second layer is the two-dimensional chiral hybrid perovskite that is an active spin filter, allowing only holes with specific spin to pass by, depending on the helicity of the chiral molecules. The third layer is the emitter film, composed of a non-chiral inorganic perovskite such as CsPbBr3. The fourth and fifth layers are the cathode that injects spin up and spin down electrons. Only the spin down electrons recombine with the spin up injected holes to produce circularly polarized light with helicity that depends on the chiral molecules helicity in the two-dimensional organic-inorganic layer. Credit Adapted from: Kim, Y.H. et. al., Science (2021) Usage Restrictions Non commercial, with attribution. License Licensed content Disclaimer: AAAS and EurekAlert! are not responsible for the accuracy of news releases posted to EurekAlert! by contributing institutions or for the use of any information through the EurekAlert system.