Seven doped materials show different fluorescence and phosphorescence colors, the materials show cyan or green fluorescence under 365 nm UV light and exhibit green or yellow afterglow after removing the UV lamp (Figure ). From 2-QL/BPO to 8-QL/BPO, the maximum phosphorescence peaks are 490 nm (multi-peaks) -560 nm (Figure ), the phosphorescence quantum efficiencies are 1.4% -5.3%, and the phosphorescence lifetimes are 72 ms -112ms (Figure , Table ). It is well known that in most doped systems the phosphorescence is actually emitted by guest molecules, and the guest molecules are doped into the host matrix in an aggregated state or individually dispersed state. In this system, although the guest molecules in the solution state have almost the same absorption wavelength and phosphorescence emission wavelength/77K (Supplementary Figure ), the phosphorescence properties of the doped materials are quite different. Therefore, guest molecules are present in the host in clusters rather than individually . These results suggest that although different phenyl positions do not affect the energy levels of the guest molecules, they can affect the molecular arrangement, resulting in different phosphorescence properties of the doped materials. According to the previous works, the T1 state of the host matrix can be the bridge between the S1 and T1 states of the guest, so the excitons can transfer from S1 state to T1 state of the guest through the path of the T1 state of the host. As shown in Figure , the S1 and T1 states of 5-QL are 4.05 eV and 2.69 eV, respectively, and the ΔEST is 1.36 eV. Such large energy gaps make it difficult for intersystem crossing (ISC) of excitons. However, the band gap between the S1 state of BPO and the T1 state of BPO is only 0.33 eV, which is very beneficial for ISC of excitons. Effects of Different Metal Salts on Phosphorescence Properties. Improving and enriching phosphorescence properties is a challenge that must be overcome for materials to realize practical applications. In most doped systems, the host matrix acts as a container to encapsulate the guest molecules, and the interaction of the two causes the guest to emit phosphorescence. However, people often ignore the fact that the host is equivalent to a container, which can encapsulate not only the guest but also the third component such as water, acid, initiator, and even metal salts. Therefore, in this work, a series of metal salts with empty orbitals (Al 3+ , Cu + /Cu 2+ , Zn 2+ , Ga 3+ , Ag + , Cd 2+ , In 3+ ) were selected to be doped into the host as the third component to coordinate with the guests. Since the concentration of the third component have an impact on the phosphorescent activities of the materials, a series of 5-QL/PBO/CdI2 and 5-QL/PBO/InCl3 doped materials with different molar ratios (1:1000:0.1-1:1000:50) were prepared to optimize the luminescence activities. As shown in Figure , the CdI2 can greatly increase the phosphorescence intensity, while InCl3 can effectively increase the emission wavelength. And when the ratio is 1:1000:5 (Guest: Host: Metal salt), the three-component doped materials have the strongest phosphorescence intensity or longest phosphorescence. Compared with 5-QL/PBO, the phosphorescence intensity of 5-QL/PBO/CdI2 is enhanced by 11 times, and the phosphorescence wavelength is red-shifted by 7 nm. Corresponding, although the phosphorescence intensity of 5-QL/PBO/InCl3 is only increased by a factor of 4.1, the wavelength is red-shifted by 28 nm. However, even if the ratio of metal ions is further increased to 1:1000:50, there is no obvious further change in the luminescence phenomenon of the doped materials.