'serious relaxation' is a correct and usable phrase in written English.
You can use it when you want to emphasize that time spent relaxing should be taken seriously. For example, "We all need serious relaxation after this stressful week."
One sure fire way to get in some serious rest and relaxation is to enjoy some personal pampering at a spa which offers luxurious treatments to help you unwind.
Therefore, RE-doped nanophosphors suffer more serious nonradiative relaxation than corresponding bulk power phosphors.
But is there a serious objection to the relaxation of planning rules that means schools can now open in places where they might once not have been allowed?
Amateurs, hobbyists, and serious volunteers often find rest and relaxation in various casual interests, which they seek between sessions of serious activity.
William Cope Moyers, the vice president for external affairs at Hazelden in Center City, Minn., and the author of "Broken" (Viking, 2006), an addiction memoir, said the tendency of equating recovery with rest and relaxation trivializes a serious illness.
Achieving both reflection and relaxation demonstrated that serious study can take place in a creative atmosphere that has the potential for intense learning about oneself, others and the world.
To many people botanical subjects seem not altogether serious... a kind of pictorial relaxation, an easy matter compared to landscape or the human figure".
Unfortunately, high specific surface area and surface defects of the nanophosphors always result in serious surface recombination, which is a pathway for nonradiative relaxation [10].
It is observed that the dielectric relaxation for the as-deposited sample (triangle symbol) is much serious than the annealed one (square symbol).
