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This work presents accurate {\it ab initio} investigations of variousspectroscopic properties of a few Li-like ions in presence of a plasmaenvironment within the Debye screening potential. The coupled-cluster theory inthe relativistic framework has been employed to compute ionization potentials,excitation energies, electric dipole oscillator strengths, and electricquadrupole transition probabilities of Li-like C$^{3+}$, N$^{4+}$, and O$^{5+}$ions. The unretarded Breit interaction has been implemented to increase theaccuracy of the calculations. The effects of ion density and temperature on theionization potentials, excitation energies, electric dipole oscillatorstrengths, and electric quadrupole transition probabilities have beeninvestigated in the plasma environment. It is found that the plasma screeningleads to a sharp decrease in the ionization potential as the screening strengthincreases. With increasing strength, the oscillator strengths associated with2$s ^{2}S_{1/2}$$\rightarrow2 p ^{2}P_{1/2, 3/2}$ transitions increase, whereasthe transition probabilities associated with 3$d ^2D_{3/2, 5/2}$$\rightarrow2 s^2S_{1/2}$ transitions decrease.

Effect of screening on spectroscopic properties of Li-like ions in plasma environment