Wc. Harsch et al., HIGH-BRIGHTNESS BLUE-GREEN LIGHT-EMITTING-DIODES ON ZNSE SUBSTRATES, Physica status solidi. b, Basic research, 187(2), 1995, pp. 467-470
High-brightness blue and green light-emitting diodes (LEDs) are produc
ed based on homoepitaxial films grown by molecular beam epitaxy (MBE)
on high quality ZnSe substrates. The substrates are grown by the Eagle
-Picher, seeded physical vapor transport (SPVT(TM)) technique. The sub
strates are twin-free and contain no low-angle grain boundaries. Doubl
e-crystal X-ray diffraction rocking curve studies yield a FWHM [400] =
11'' to 16'', indicating a crystal quality comparable to that of GaAs
substrates. The blue LEDs produce 327 mu W (10 mA, 3.2 V), with the l
ight output sharply peaked at 489 nm, and exhibit an external quantum
efficiency of 1.3%. The green LEDs produce 1.3 mW (10 mA; 3.2 V) peake
d at 512 nm, corresponding to an external quantum efficiency of 5.3%.