Improvement in luminescent properties and thermo-optical conversion mechanism of Na₂SiF₆:Mn⁴⁺,K⁺@GQDs

Abstract

The optimal sample exhibits high stability due to large negative thermal quenching. The mechanism of negative thermal quenching is suggested to be the conversion of thermal energy into light energy.

Single Bi3+ Ultrabroadband White Luminescence in Double Perovskite via Crystal Lattice Engineering toward Light‐Emitting Diode Applications

“…Li + /Na + /K + cation codoping is a common strategy for enhancing luminescent materials, and this strategy has been successfully applied to phosphor systems such as CaYGaO 4 :Bi 3+ , CaSr 0.97 Al 2 SiO 7 :0.03Ce 3+ , and Na 2 SiF 6 :Mn 4+ . [1,39,42] Therefore, we used Li 2 CO 3 /Na 2 CO 3 /K 2 CO 3 as a basic cationic raw material to enhance the emission intensity of BZWO:0.006Bi 3+ phosphors. Figure 6a-c depicts the emission spectra of BZWO:0.006Bi 3+ doped with alkaline cations (Li 2 CO 3 /Na 2 CO 3 /K 2 CO 3 ).…”