Photocatalytic filter and air conditioning device comprising photocatalytic filter

An air conditioning device comprising:

• a photocatalytic filter including a plurality of transition metal plates having a surface on which a transition metal oxide is formed as a plurality of nanotubes thereon, wherein the plurality of transition metal plates are spaced apart from each other to allow air to pass between the plurality of transition metal plates, and wherein the transition metal oxide removes gas included in the air and includes at least one of TiO2, ZnO, NiO, or WO3;
• and
• a light source configured to irradiate the photocatalytic filter with light, the light source including a plurality of light emitting diodes (LEDs) corresponding to the plurality of transition metal plates, respectively, wherein the plurality of LEDs is disposed on a transition metal plate that is adjacent to a target transition metal plate to be irradiated with light by each of the plurality of LEDs,
• wherein a width of a first transition metal plate among the plurality of transition metal plates is determined based on a light emission angle of a first LED corresponding to the first transition metal plate and a distance between the first transition metal plate and the first LED.