Break the Interacting Bridge between Eu³⁺ Ions in the 3D Network Structure of CdMoO₄: Eu³⁺ Bright Red Emission Phosphor

Eu³⁺ doped CdMoO₄ super red emission phosphors with charge compensation were prepared by the traditional high temperature solid-state reaction method in air atmosphere. The interrelationships between photoluminescence properties and crystalline environments were investigated in detail. The 3D network structure which composed by CdO₈ and MoO₄ polyhedra can collect and efficiently transmit energy to Eu³⁺ luminescent centers. The relative distance between Eu³⁺ ions decreased and energy interaction increased sharply with the appearance of interstitial occupation of O^2- ions (O″_i). Therefore, fluorescence quenching occurs at the low concentration of Eu³⁺ ions in the 3D network structure. Fortunately, the charge compensator will reduce the concentration of O″_i which can break the energetic interaction between Eu³⁺ ions. The mechanism of different charge compensators has been studied in detail. The strong excitation band situated at ultraviolet and near-ultraviolet region makes it a potential red phosphor candidate for n-UV based LED.