Blue light from consumer grade display panels isn’t harmful in any way other than disrupting your sleep, which you can solve by avoiding using your phone in bed. Same for emf radiation, no data supports the idea of it being significantly harmful.
“Compared to the risk from aging, smoking, cardiovascular disease, high blood pressure, and being overweight, exposure to typical levels of blue light from consumer electronics is negligible in terms of increased risk of macular degeneration or blindness. Furthermore, the current evidence does not support the use of blue light-blocking lenses to protect the health of the retina, and advertisers have even been fined for misleading claims about these types of lenses.”
From Harvard University publications.
The biggest risk is addiction and taking your attention away from social activities, exercise, or studying etc.