Well if you want to get down to the nitty gritty, everything is waves and empty space anyway, and yet Heisenberg's uncertainty principle asserts that this thing we call "empty space" is practically foaming at the mouth with spontaneous creation of particles and antiparticles at any one specific moment in time.
And since everything is basically waves anyway, you could, in a not very strict sense, claim that everything is "creating" energy all the time, except it's also "destroying" energy all the time too, before anybody can notice.
So sure. Photosynthesis "creates" energy. But so does everything and nothing.