國際光日(International Day of Light, IDL)乃是聯合國教科文組織(UNESCO)所發起，向全世界提倡以光學、光電為基礎的技術。光是經濟的驅動力，將塑型我們的未來社會，人類對光的發現與應用，正從幾何光學、波動光學，一步步邁向未來關鍵的量子技術，此將再度促進科技的快速發展，為全世界帶來革命性的貢獻。

International Day of Light (IDL) is initiated by UNESCO, who promotes the technology based on optics and optoelectronics to the world. Light is the driving force of the economy, which will shape our future society. The discovery and application of light by human beings are moving from geometric optics and wave optics to key quantum technologies in the future. This will once again promote the rapid development of science and technology. Bring revolutionary contributions to the world.