Clarifying concentration quenching mechanisms by lattice site-occupation and luminescence kinetics of Eu³⁺-activated Cs₂Mg₂Mo₃O₁₂

Abstract

Cs2Mg2Mo3O12:Eu3+ shows intense narrow red luminescence (FWHM of ∼1 nm). Concentration quenching is caused by multi-sites and energy transfer confirmed by Eu3+ spectral probe.

Local Structure and Speciation-Driven UO22+ → Sm3+ Energy Transfer for Enhanced Luminescence in Li2B4O7

“…Phosphor-converted light-emitting diodes (pc-LEDs) have emerged out as a potential solution to alleviate the crisis scenario triggered by the huge energy demand for lighting purposes. − In past decades, scientists worldwide have explored diverse lanthanide ion (Ln 3+ )-doped host matrices to design next-generation smart pc-LEDs to meet the requirements of high luminous efficiency, eco-friendliness, high color rendering index (CRI), optimum correlated color temperature (CCT), and long-serving lifetimes for solid-state lighting applications. ,− The deficiency of the red component is the major bottleneck in the development of commercial white light-emitting pc-LEDs with a combination of YAG:Ce and blue (In,Ga)N chip in order to achieve warm pc-LEDs with low CCT . The quest for red-emitting phosphors to compensate for the red spectral region aroused huge scientific interest in exploring novel Eu 3+ and Sm 3+ -based phosphors. − Sm 3+ phosphors are promising for achieving orange red emissions on near ultraviolet (NUV) and blue excitations . Despite the large progress, the problem of insufficient molar absorption coefficients of Ln 3+ ions in the NUV region due to parity forbidden 4f → 4f transitions needs to be tackled. , The introduction of sensitizer ions in the host matrix is a promising approach to improve the Ln 3+ emission via energy transfer (ET) routes. ,, …”