Surprisingly, they actually are blue dies with red phosphor. Keeping all the colours the same forward voltage makes driving them a lot easier, as well as having all the colours in the same production process.
It seems conceivable that a red LED based on phosphor excitation could exist somewhere where having the same forward voltage for different colors was essential, but I haven't been able to find one.
Taking into account the different forward voltages for different LED colors is a standard part of designing an LED circuit. One of the LED data sheets I have on hand for some 5 mm LEDs includes a forward voltage chart with 1.9 V for red and 3.2 V for blue.
Do you have a part number for a red LED that operates by illuminating a red phosphor with a blue LED?
Taking into account the different forward voltages for different LED colors is a standard part of designing an LED circuit. One of the LED data sheets I have on hand for some 5 mm LEDs includes a forward voltage chart with 1.9 V for red and 3.2 V for blue.
Do you have a part number for a red LED that operates by illuminating a red phosphor with a blue LED?