Fig. 4: Temperature-dependent characteristic of TPP₃Cu₂Br₂.

a Temperature-dependent PXRD patterns of TPP₃Cu₂Br₂ with temperature from 300 to 380 K. b Temperature-dependent PL spectra of TPP₃Cu₂Br₂ with temperature from 280 to 380 K (λ_ex = 355 nm). c Temperature-dependent decays of TPP₃Cu₂Br₂ with temperature from 280 to 380 K (λ_ex = 355 nm, λ_em = 524 nm). d Integrated PL intensity and PL lifetime of TPP₃Cu₂Br₂ at different temperatures. e Calculated S_r values based on the PL lifetime of TPP₃Cu₂Br₂ at different temperatures. f) PL lifetime of TPP₃Cu₂Br₂ at 280 K and 380 K through multiple heating and cooling cycles