Tungsten trioxide nanopowder has photochromic properties, so it can be used as a near infrared shielding material, and thus applied to produce a variety of insulation films, such as auto films and window films of building. Furthermore, people who stay in these spaces will feel more comfortable. In addition, it also saves energy consumption and helps protect environment.
The rapid development of photochromism was after the 1990s, which was attributed to the development of laser technology. A laser is a device that emits light through a process of optical amplification based on the stimulated emission of electromagnetic radiation. The term "laser" originated as an acronym for "light amplification by stimulated emission of radiation". The first laser was built in 1960 by Theodore H. Maiman at Hughes Research Laboratories, based on theoretical work by Charles Hard Townes and Arthur Leonard Schawlow. With the rapid development of nanoscience, optoelectronics and supramolecular chemistry, photochromic materials have great potential applications in information display, sensors, ultrahigh density optical memory, and anti-fake. With the deepening of research, tungsten trioxide will have wider applications.
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