Efficient white and red light emission from GaN/tris-(8-hydroxyquinolato) aluminum/platinum(II) meso-tetrakis(pentafluorophenyl) porphyrin hybrid light-emitting diodes

We report efficient white and red light emission from GaN light-emitting diode (LED)/tris-(8-hydroxyquinolato) aluminum (Alq(3))/platinum(II) meso-tetrakis(pentafluorophenyl) porphyrin (PtF20TPP) hybrid LEDs. Alq(3) was employed to enhance the efficiency of red and white luminescence conversion (LC) LEDs through energy transfer from Alq(3) to PtF20TPP. In the white LC-LED, an intense, highly pure white-light emission with CIE_1931 coordinates at x=0.32 and y=0.31 is obtained. The LC-LEDs in this work have relatively high efficiencies, 3.3% for white LC-LED and 4.0% for red LC-LED. The color temperature (T-c), color rendering index (R-a) and luminous efficiency (eta(L)) of the white LC-LED at 20 mA are 6800 K, 90.6 and 10 lm/W, respectively. (C) 2003 American Institute of Physics.