Something is bothering me when I consider the forward voltage of tiny monochrome LEDs. Consider the following data from datasheets of tiny SMT monochrome LEDs of different colors (sources red yellow green blue):
And finally blue, the odd one:
Why the discontinuity on blue?
As I understand it, voltage is supposed to be directly proportional to frequency, which kinda explains why blue is higher (at least 2.66V, if I did my math right), but doesn't explain the discontinuity.