Appendix A. Supplementary data

The supporting information includes the following five tables： Table A1 Fractional atomic coordinates (×104) and equivalent isotropic displacement parameters (Å2×103) for (2-5-py)2MnBr4. Table A2 Anisotropic displacement parameters (Å2×103) for (2-5-py)2MnBr4. The anisotropic displacement factor exponent takes the form: -2π2[h2a*2U11+2hka*b*U12+…]. Table A3 Bond length for (2-5-py)2MnBr4. Table A4 Bond angle for (2-5-py)2MnBr4. Table A5 Performance parameters of white LEDs at different currents. The crystal structure is stored in the Cambridge Crystal Structure Database, and the relevant link has been given.