1. (a) Absorption spectra of time-temperature evolution of CdSe MSNs samples dispersed in toluene, (b) normalized absorption spectrum (black line, left y-axis) and emission (red line, excitation wavelength 355 nm, right y-axis) of CdSe MSNs obtained at 200 ℃/6 min, and (c) schematic of crystal structure of CdSe in wurtzite (from three different directions of a, b and c, respectively)

2. (a) HRTEM image of CdSe MSNs with (b) corresponding selected area correlation pattern of the square in (a), (c) FFT- HRTEM image of CdSe MSNs, and (d, e) elemental mapping images of CdSe MSNs

3. (a) High pressure photoluminescence spectra of CdSe MSNs, and (b) comparison of photoluminescence spectra of CdSe MSNs before and after compression (1 atm=101325 Pa)

4. (a) In situ high pressure UV-Vis absorption spectra, (b, c) band gap evolution of CdSe MSNs in the process of pressurization and pressure relief, and (d) HRTEM image of CdSe MSNs after the pressure relief r2.06 and r0 in (a) represent the pressure released to 2.06 GPa and ambient conditions