Fig. 1. (a) Crystal structure of BSCSC MCs and the pictures of a series of sample under daylight and UV lamp. (b) XRD patterns of Cs2SnCl6, Bi-, Sb-, and Bi-and-Sb-doped Cs2SnCl6. (c) Optical absorption and PL spectra of Cs2SnCl6, Bi-, Sb-, and Bi-and-Sb-doped Cs2SnCl6. (d) XPS spectra for 12%10%BSCSC MCs. (e) SEM and EDS mappings of Sb, Bi, Cs, Cl, and Sn elements. (f) EDS of 12%10%BSCSC MCs. The inset shows the atomic ratios for various elements.

Fig. 2. PL spectra of BSCSC MCs with different (a) Bi and (b) Sb feeding contents. (c) PL spectra of 12%10%BSCSC MCs at 405 nm CW laser excitation under different pump fluences. (d) The linear fitting between PL intensity and pump fluence.

Fig. 3. (a) PL intensity of 12%10%BSCSC MCs at 80–380 K. (b) Pseudocolor map of PL intensity at 80–380 K. (c) The PL integral intensity of 12%10%BSCSC MCs at various temperatures. (d) The peak position with the change of temperature.

Fig. 4. (a) TRPL decay curves of 9%Biy% (y=0, 5, 10, 20) Sb codoped Cs2SnCl6 at 290 K. (b) TRPL decay curves of x% (x=0, 6, 9, 12) Bi10%Sb codoped Cs2SnCl6 at 290 K. (c), (d) TRPL spectra of 12%10%BSCSC MCs from 150 to 900 ns and 3.5 to 15 μs at 290 K.

Fig. 5. Temperature-dependent TRPL decay curves of 12%10%BSCSC MCs from 190 to 400 K at the wavelength of (a) 485 nm and (b) 650 nm. (c) PL lifetime with temperature increasing. (d) Schematic energy diagram for BSCSC MCs. (e) The lifetime of 485 nm emission under 290–390 K. (f) SA and SR values of 485 nm emission.

Fig. 6. (a) Electrically driven PL of white-emission LED based on Bi-and-Sb-codoped Cs2SnCl6 powder, and the insets are the working LED and PL intensity versus time. (b) The PL spectra of LED with current at 100–340 mA; the inset is the corresponding CIE chromaticity coordinate.

Table 1. Several Thermometric Materials and Their Relative Sensitivity