For optimal energy transfer in self-luminous lanthanide metal-organic frameworks (Ln-MOFs), the energy of the lowest triplet excited state must align with ideal energy levels. Failure to meet this condition can lead to reverse energy transfer, reducing luminous efficiency. In this study, we developed a mixed-ligand MOF, Eu-TCPP-BOP, which exists as an ECL self-enhancing luminophore. We used SPECM to study the role of boron ligands as a bridge for electron transport in improving the ECL performance of Eu-TCPP. The ligands H