This research aims to overcome the fundamental trade-off between the dissymmetry factor (_glum) and photoluminescence quantum yield (ϕ) in organic circularly polarized luminescence (CPL) materials, thereby enabling the emergence of new photofunctional properties. In general, organic molecules exhibit extremely small magnetic dipole moments (m) compared to electric dipole moments (μ), resulting in intrinsically low _glum values. Although phosphorescence, based on spin-forbidden transitions, can  enhance _glum due to the inherently small μ, it simultaneously suffers from low radiative decay rates and weak absorption, leading to reduced ϕ. This _glum–ϕ trade-off has long been considered a key limiting factor in the performance of CPL materials. The applicant has previously demonstrated that simple blending of lead halide perovskite nanocrystals (PNCs) with dye molecules enables efficient room-temperature phosphorescence by effectively suppressing non-radiative deactivation pathways such as thermal quenching and oxygen-induced quenching, using PNCs as triplet sensitizing matrices. In this study, CPL-active molecules will be embedded into the PNC matrix to simultaneously (i) reduce μ via the use of phosphorescence and (ii) enhance m through the heavy-atom effect of the PNCs, thereby realizing high _glum. Additionally, the superior film-forming properties of PNCs are expected to drastically reduce non-radiative processes, contributing to a substantial increase in ϕ. Through this approach, the study aims to overcome the conventional performance limits of CPL materials by leveraging a “low-μ strategy,” which has traditionally been regarded as disadvantageous, and to establish a new class of high-performance CPL systems.