CdI2 is still to increase the phosphorescence intensity, compared with the twocomponent doped materials, the phosphorescence quantum efficiency of threecomponent doped materials reaches 54% -63%. (Figure , Table ). It is worth pointing out that the phosphorescence quantum efficiency increased from 1.4% of 7-QL/BPO to 54% of 7-QL/BPO/CdI2, an increase of 38 times. The AlCl3, GaCl3 and InCl3 also play a role in significantly increasing the phosphorescence wavelength, the three-component materials are red-shifted by 36-56 nm compared with the twocomponent materials (Figure , Table ). Similarly, from AlCl3 to InCl3, with the increase of the metal ion quality, the phosphorescence intensity gradually increases (Table ). In addition, GaCl3, InCl3, and Cu(CF3SO3)2 can effectively prolong the phosphorescence lifetime of materials, especially Cu(CF3SO3)2. Among them, the phosphorescence lifetime from 85 ms of 6-QL/BPO to 304 ms of 6-QL/BPO/Cu(CF3SO3)2, an increase of 3.6 times (Figure , Table ) . To sum up, the influence of the same metal ion on the phosphorescence properties of different doped materials is basically the same, but the influence of different metal ions on the phosphorescence properties of the same doped material is very different. These results also indicate that the different interactions between various metal ions and guests lead to the abundant phosphorescence phenomenon of doped materials. Coordination of metal salt to guest. To further investigate whether it is the coordination of metal ions with guest molecules that enhances the phosphorescence properties of doped materials. First, seven metal salts were separately doped into the host matrix (Molar ratio of metal salts to host is 5:1000), and the results showed that these doped materials only had the phosphorescence of the host itself, which means that the metal salts do not emit phosphorescence in the host matrix (Figure ). The coordination of quinoline compounds with metals essentially means that the lone pair of electrons of the nitrogen atom occupies the empty orbital of the metal. Therefore, if the lone pair of electrons of the nitrogen atom cannot interact with the empty orbital of the metal, the metal ions cannot coordinate with the quinoline compounds. Based on this, we salified 5-QL to obtain hexafluorophosphate/5-QL-PF6, as shown in Figure , the salted nitrogen atoms no longer have lone pairs of electrons. The two-component doped material obtained by 5-QL-PF6 and the host has bright yellow phosphorescence, and the quantum efficiency reaches 18% (Figure ). However, the phosphorescence properties of the three-component materials 5-QL-PF6/BPO/CF3COOAg and 5-QL-PF6/BPO/CdI2 are almost unchanged compared with the two-component materials 5-QL-PF6/BPO (Figure ). This result indirectly confirms that metal ions enhance the phosphorescence properties of doped materials through coordination with nitrogen atoms in quinoline. Since AlCl3 causes the most obvious red shift of the phosphorescence wavelength of the doped materials, the UV absorption wavelengths of 5-QL/BPO, AlCl3/BPO and 5-QL/BPO/AlCl3 were tested. The results show that the absorption wavelength of 5-QL/BPO/AlCl3 is significantly red-shifted compared to 5-QL/BPO and AlCl3/BPO, which also proves the formation of coordination reaction between the metal and the guest (Figure ). To further understand the effect of metal ions on the guest, theoretical simulations were first performed on the configurations of 5-QL-AlCl3 and 5-QL-CdI2 (Supplementary Figure ). On this basis, the energy levels and spin-orbit coupling (SOC) constants of 5-QL-AlCl3 and 5-QL-CdI2 are calculated. The results show that compared with 5-QL, AlCl3 reduces the excited state energy level of the molecule, the lowest triplet energy level/T1 is reduced from 2.69 eV of 5-QL to 2.41 eV of 5-QL-AlCl3 (Figure ). And CdI2 can greatly increase the SOC values, the SOC is increased from 1.16 cm -1 of S1-T1 of 5-QL to112.6 cm -1 of S1-T1of 5-QL-CdI2 (Figure ). This is also consistent with the experimental results that AlCl3 extends the phosphorescence wavelength and CdI2 increases the phosphorescence intensity.