By courtesy of:
Hojin Lee, Aaron R. Johnson, and Jerzy Kanicki
IEEE TRANSACTIONS ON ELECTRON DEVICES 2006, 53, No.3, 427
and another review on RGB LED:
Recent development of polyfluorene-based RGB materials for light emitting diodes
Weishi Wu*, Michael Inbasekaran, Michelle Hudack, Dean Welsh, Wanglin Yu, Yang Cheng, Chun Wang, Shari Kram, Melissa Tacey, Mark Bernius, Robert Fletcher, Kelly Kiszka, Steve Munger, James O’Brien
Microelectronics Journal 35 (2004) 343–348