spacediver wrote:So "old" smartphones don't display blue-violet light?
It is very dependant on the phosphor used in the high-efficiency white LED backlights on smartphones.
Some of them deep blue / violet light to light up white phosphor efficiently.
They are easily reformulated and engineered to reduce the amount of blue light, at low efficiencies.
Much newer OLED smartphones don't use this technique, so would be immune from this problem. So you Samsung Galaxy S3 users should be scots-free.
I would imagine that phone manufacturers can reformulate the phosphor for white LEDs to fix the violet-light emission problem, if this ends up becoming a very serious issue. Alternatively, new tech such as OLED can avoid this problem entirely.
The average ownership lifecycle of a smartphone has tended to be about 2 years, so new tech can quickly solve this problem, if more scientific papers show an issue with this.