For the same cation salts, different anions have different effects on the coordination ability of metal ions and nitrogen atoms. Therefore, the effects of various metal salts on the phosphorescence properties of the doped system were first screened. Three threecomponent doped materials 5-QL/BPO/Al 3+ were prepared by selecting three aluminum salts AlCl3, Al(CF3SO3)3 and Al(NO3)3 as the third components, respectively. Compared with 5-QL/BPO, the phosphorescence wavelength of 5-QL/BPO/Al 3+ is red-shifted by 35-41 nm, the phosphorescence intensity is enhanced by 1.17-1.41 times (Figure ), and the phosphorescence lifetime is slightly reduced to 85-92 ms (Figure ). From these results, it can be found that the main function of aluminum ions is to increase the phosphorescence wavelength of the materials, and among them, and AlCl3 has the best effect (Figure ). Next, Seven monovalent and divalent copper salts (Cu(CF3SO3)2, CuSO4, Cu(NO3)2, CuCl2, CuCl, CuBr, CuI, CuCN) were selected. The results show that the divalent copper salts can more effectively enhance the phosphorescence intensity of the doped materials than the monovalent copper salts (Figure ). This is because in general, the coordination ability of divalent copper ions is stronger than that of monovalent copper ions. Among them, Cu(CF3SO3)2 can play the best effect, compared with 5-QL/BPO, the phosphorescence intensity of 5-QL/BPO/Cu(CF3SO3)2 is increased by 2.86 times, and the phosphorescence lifetime is also increased by 2.98 times to 301 ms (Figure ). But the copper salts have little effect on the phosphorescence wavelength, the red-shift is only 12 nm at most. For the four zinc salts (ZnCl2, Zn(NO3)2, Zn(CH3CO2)2, Zn(CF3SO3)2), the highest phosphorescence intensity can be increased by 4.14 times (5-QL/BPO/ZnCl2), the phosphorescence lifetime is slightly reduced to 88-95 ms (Figure , 3h, 3m) . Similarly, zinc salts have little effect on the phosphorescence wavelength of the doped materials. Since silver and cadmium are heavy atoms, they can greatly improve the phosphorescence intensity of doped materials. Compared with 5-QL/BPO, the phosphorescence intensities of 5-QL/BPO/CF3CO2Ag and 5-QL/BPO/CdI2 were increased by 11.7 and 13.8 times, respectively (Figure ). But different anion salts also show a huge difference in the effect on the phosphorescence properties. Among the six silver salts (CF3SO3Ag, Ag2SO4, AgCl, CF3CO2Ag, AgNO2, AgNO3) and three chromium salts (CdCl2, Cd(NO3)2, CdI2), the smallest phosphorescence intensity was only increased by a factor of 3.9 (5-QL/BPO/Ag2SO4) and 4.8 (5-QL/BPO/Cd(NO3)2), respectively (Figure , 3e, 3n, 3o). And the phosphorescence lifetimes of 5-QL/BPO/Ag + and 5-QL/BPO/Cd 2+ are also slightly shortened to 33-86 ms and 43-92 ms, respectively (Figure , 3j). It is worth pointing out that 5-QL/BPO/CF3CO2Ag and 5-QL/BPO/CdI2 have pure phosphorescence emission because the heavy atom effect of metals can effectively improve the intersystem crossing ability of excitons. As shown in Figure , the prompt spectra and the delayed spectra of the two doped materials almost completely coincide. And the time-resolved prompt emission decay curves shown that the emission intensity do not decay as quickly as ordinary fluorescence materials in the decay range of 200 ns (Supplementary Figure ), which indicates that the nanosecond lifetime is almost nonexistent. For the selection of gallium and indium salts, with AlCl3 as the reference (Al, Ga, and In is an element of the same main group), GaCl3 and InCl3 were selected as the third components. Similar to AlCl3, GaCl3/InCl3 can red-shift phosphorescence wavelengths by 36 nm and 31 nm, respectively (Figure , Supplementary Figure ). And the phosphorescence lifetime is increased to 120 ms and 135 ms, respectively. In addition, compared with 5-QL/BPO, from 5-QL/BPO/ AlCl3 to 5-QL/BPO/ GaCl3 to 5-QL/BPO/InCl3, the phosphorescence intensity is improved by 1.72, 3.39 and 6.38 times, respectively (Supplementary Figure ). This is because the increase in atomic mass from aluminum to indium improves the phosphorescence intensity of the materials. In summary, AlCl3, Cu(CF3SO3)2, ZnCl2, GaCl3, CF3CO2Ag, CdI2, and InCl3 are the seven salts with the best effect on improving the luminescence properties of doped materials. The main function of Ag + and Cd + is to greatly prove the phosphorescence intensity, the Al 3+ , Ga , and In 3+ are to enhance the phosphorescence wavelength, and the Cu 2+ , Ga 3+ , and In 3+ can increase the phosphorescence lifetime. In addition, to better quantify the extent of the influence of metal salts on the luminescence intensity, the phosphorescence quantum efficiencies of seven three-component doped materials were tested (5-QL/BPO/AlCl3, 5-QL/BPO/Cu(CF3SO3)2, 5-QL/BPO/ZnCl2, 5-QL/BPO/GaCl3, 5-QL/BPO/CF3CO2Ag, 5-QL/BPO/CdI2, 5-QL/BPO/InCl3), and the results are 6.6%, 12%, 18%, 17%, 61%, 70%, and 28%, respectively (Table ). Compared with 4.5% of 5-QL/BPO, the phosphorescence efficiency of the three-component doped materials is increased by a factor of 1.46 -11.66. It should be pointed out that the powders formed by the 5-QL guest and metals also have no phosphorescence emission at room temperature (Supplementary Figure ), which further indicates that the host matrix plays an indispensable role in the luminescence of the guests.