cell applications and light-emitting diodes as the active layer. MHPs have been intensively researched to modulate and optimize their performance by changing their chemical composition, crystal orientation, dimensionality, and morphology to fit the vast number of new potential applications, in which MHPs materials seem to be the next breakthrough. For example, several reports have highlighted the unprecedented quantum-cutting mechanism in Yb 3+ -doped CsPbX 3 nanocrystals and thin films with photoluminescence quantum efficiencies exceeding 100%, with practical applications in solar spectral shifting, luminescent solar concentration, and near infra-red (NIR) light emitting diodes. [2,13,22,23] Several essential issues must be overcome before perovskite hits the market. Most of these opportunity areas are chemical stability, toxicity, and processability. Since water and oxygen play a significant role in the perovskite degradation mechanism, [24,25] the synthesis of MHPs materials has been restricted to strict atmospheric conditions to avoid moisture and ambient air. [26] Among the synthetic routes for perovskite film deposition, solution-based techniques are highly advantageous, where spin coating is the most studied technique. [29] However, its implementation at an industrial production scale is usually limited CsPbX 3 (X = Cl, Br, I) perovskites have emerged as promising materials for optoelectronic applications. However, thin film synthesis has essential issues such as chemical stability, toxicity, and processability. In this work, a green synthesis approach using water as the only solvent to deposit CsPbCl 3 and CsPbCl 3 :Yb 3+ films by aerosol assisted chemical vapor deposition technique under ambient atmospheric conditions, is proposed. X-ray diffraction pattern and X-ray photoelectron spectroscopy analysis confirm the phase purity and negligible degradation by using water during deposition. Moreover, CsPb 2 Cl 5 secondary phase is detected as a substitution and anchoring doped mechanism response for doped materials. Additionally, green antisolvents (alcohols and propan-2-one) are used to assist the crystallization process; all the green antisolvents result in an increased substrate coverage, highlighting those with high boiling points and low heat of combustion that promote heterogeneous nucleation. As-deposited films show a photoluminescent excitonic emission peak around 418 nm and an additional peak at 984 nm emission band associated with the Yb 3+ infrared 2F 5/2 to 2F 7/2 transitions for doped materials. Near infra-red photoluminescence emission is notably improved upon antisolvent assistance up to a threefold increase for ethanol, reaching a photoluminescence quantum yield of 33.94% at low Yb 3+ concentration.