Fig. 2: RTP properties and microstructures of CBtCOONa/CaCO3.

a Phosphorescence lifetime of RTP materials with different CBtCOONa contents (Ex = 310 nm, detection wavelength = 450 nm); b Quantum yield of RTP materials with different CBtCOONa contents (Ex = 310 nm); c Phosphorescence lifetime of RTP materials with different CBtCOONa contents (Ex = 370 nm, detection wavelength = 500 nm); d Quantum yield of RTP materials with different CBtCOONa contents (Ex = 370 nm); e Scanning electron microscope (SEM) images of RTP materials with different CBtCOONa contents.