Currently, there is a great demand for non-toxic lead-free perovskites as active materials for solar cells and light-emitting diodes (LEDs). In the first case, great progress has been made using 3D tin perovskites. At the same time, the search for a suitable lead-free perovskite material for LEDs is just at the beginning. From general considerations and by analogy with lead-containing perovskites, the most suitable structures for optoelectronic light-emitting devices should be 2D perovskites since they possess higher stability and high exciton binding energy resulting in high photoluminescence (PL) ability. An additional requirement from industry for such a material is a possibility to be manufactured by inkjet-printing on a flexible substrate. In this work, we have studied PL properties of chemically stabilized 2D perovskite thienylethylammonium tin iodide, (TEA)₂SnI₄, thin films of which were produced by inkjet-printing of precursors on a flexible polymer substrate (polyimide, PI). PL measurements performed in the 20–300 K temperature range made it possible to detect two equally narrow excitonic bands observed in the 630 - 665 nm region both in emission and absorption and exhibiting different dependences on the observation angle. In addition, m-PL mapping experiments indicate different spatial localization of radiation from these two excitons. Besides, amplified spontaneous emission and bi-exciton formation were detected at high intensity excitation at 20 K. All the above findings indicate high photophysical quality of thin (TEA)₂SnI₄ films inkjet-printed on flexible PI polymer that make them a promising non-toxic perovskite material for fabrication of efficient LEDs and microlasers.Currently, there is a great demand for non-toxic lead-free perovskites as active materials for solar cells and light-emitting diodes (LEDs). In the first case, great progress has been made using 3D tin perovskites. At the same time, the search for a suitable lead-free perovskite material for LEDs is just at the beginning. From general considerations and by analogy with lead-containing perovskites, the most suitable structures for optoelectronic light-emitting devices should be 2D perovskites since they possess higher stability and high exciton binding energy resulting in high photoluminescence (PL) ability. An additional requirement from industry for such a material is a possibility to be manufactured by inkjet-printing on a flexible substrate. In this work, we have studied PL properties of chemically stabilized 2D perovskite thienylethylammonium tin iodide, (TEA)₂SnI₄, thin films of which were produced by inkjet-printing of precursors on a flexible polymer substrate (polyimide, PI). PL measurements performed in the 20–300 K temperature range made it possible to detect two equally narrow excitonic bands observed in the 630 - 665 nm region both in emission and absorption and exhibiting different dependences on the observation angle. In addition, m-PL mapping experiments indicate different spatial localization of radiation from these two excitons. Besides, amplified spontaneous emission and bi-exciton formation were detected at high intensity excitation at 20 K. All the above findings indicate high photophysical quality of thin (TEA)₂SnI₄ films inkjet-printed on flexible PI polymer that make them a promising non-toxic perovskite material for fabrication of efficient LEDs and microlasers.