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Organic near-infrared (NIR) room temperature phosphorescence (RTP) materials have unparalleled advantages in bioimaging due to their excellent penetrability. However, limited by the energy gap law, the NIR RTP materialsare very rare, moreover, the phosphorescence lifetimes of these materials are very short. In this work, we have obtained organic RTP materials with long wavelengthsand long lifetimes for the first time through the guest-host doped strategy. The guest molecule has sufficient conjugation to reduce the lowest triplet energy level and the host assists the guest in exciton transfer and inhibits the non-radiative transition of guest excitons. These materials exhibit good tissue penetration in bioimaging. Thanks to the characteristic of long lifetime and long wavelength emissive RTP materials, the tumor imaging in living mice with a signal to background ratio value as high as 43 is successfully realized.