<p>Developing circularly polarized organic light-emitting diodes (CP-OLEDs) that simultaneously achieve a high electroluminescence dissymmetry factor (<i>g</i>_EL) and a high external quantum efficiency (EQE) remains a central challenge in polarized optoelectronics. Here, we report a general composite strategy for constructing full-color CP-OLEDs by integrating a 5CB-based chiral nematic liquid crystal (N*-LC) layer with OLEDs based on achiral emitters. The resulting CP-OLEDs exhibit both high polarization purity and high electroluminescence efficiency, with |<i>g</i>_EL| values of up to 1.9, EQEs reaching 26.9%, and <i>Q</i>-factors as high as 0.48. Notably, contrary to the conventional assumption that N*-LC integration causes severe optical losses (&gt;50%) due to Bragg reflection, the EQE of the devices is preserved mainly in this composite architecture. This behavior is attributed to an internal photon-recycling process enabled by the reflection of light within the device structure. To the best of our knowledge, these CP-OLEDs represent the highest comprehensive performance reported to date. Furthermore, the practical utility of these high-performance devices is demonstrated through the encryption and decryption of information based on circularly polarized electroluminescence.</p>