This word is acceptable for play in the US & UK dictionaries that are being used in the following games:

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n. The study or application of electromagnetic energy whose basic unit is the photon, incorporating optics, laser technology, electrical engineering, materials science, and information storage and processing.

n. the science and technology of generating and controlling photons, particularly in the visible and near infrared light spectrum

"As its name indicates, biophotonics is a term that encompasses biology, the branch of natural sciences that studies the laws of life, and photonics, that is, the science and technology focusing on generating, manipulating and detecting photons, which are the quantum units of light."