Circularly polarized light sources with free-space directional emission play a key role in chiroptics¹, spintronics², valleytronics³ and asymmetric photocatalysis⁴. However, conventional approaches fail to simultaneously realize pure circular polarization, high directionality and large emission angles in a compact emitter. Metal-halide perovskite semiconductors are promising light emitters^5,6,7,8, but the absence of an intrinsic spin-locking mechanism results in poor emission chirality. Further, device integration has undermined the efficiency and directionality of perovskite chiral emitters. Here we realize compact spin-valley-locked perovskite emitting metasurfaces where spin-dependent geometric phases are imparted into bound states in the continuum via Brillouin zone folding, and thus, photons with different spins are selectively addressed to opposite valleys. Employing this approach, chiral purity of 0.91 and emission angle of 41.0° are simultaneously achieved, with a beam divergence angle of 1.6°. With this approach, we envisage the realization of chiral light-emitting diodes, as well as the on-chip generation of entangled photon pairs.

^{具有自由空间定向发射的圆偏振光源在手性光学1}、自旋电子学²、谷电子学³和不对称光催化⁴中发挥着关键作用。然而，传统的方法无法在紧凑的发射器中同时实现纯圆偏振、高方向性和大发射角。金属卤化物钙钛矿半导体是有前途的发光体^5,6,7,8，但缺乏内在的自旋锁定机制导致发射手性较差。此外，器件集成破坏了钙钛矿手性发射体的效率和方向性。在这里，我们实现了紧凑的自旋谷锁定钙钛矿发射超表面，其中自旋相关的几何相位通过布里渊区折叠被赋予连续体中的束缚态，因此，具有不同自旋的光子被选择性地发送到相反的谷。采用这种方法，同时实现了0.91的手性纯度和41.0°的发射角，光束发散角为1.6°。通过这种方法，我们设想实现手性发光二极管，以及纠缠光子对的片上生成。