YELLOW-GREEN
Spectrographic analysis of an odd-based 5mm yellow-green LED from the 1970s.
Spectrographic analysis of a yellow-green LED from the late-1960s.
Spectrographic analysis of a flat-faced yellow-green LED from the 1980s.
Spectrographic analysis of a T½ yellow-green LED, probably from the early-1970s.
Spectrographic analysis of one of the LED segments (yellow-green) in the Rainbow Big-Digit LED Clock.
Spectrographic analysis of the yellow-green LED in the Indiana Jones Light-Up Spoon.
Spectrometer plot of a Panasonic LN3 LED - this LED looks like a germanium radio diode and was made by Panasonic in the late-1970s to the early-1980s.
They have a leakage current in the femtoamps and were used as a low leakage reference diode. Nowadays, they use something called a "bandgap reference" for the really low voltages; above about 1.8 volts we start to see ordinary zener diodes.
Spectrographic analysis of an early yellow-green LED, circa. 1976.
Spectrographic analysis of a yellow-green double-die LED from the 1970s.
Spectrographic analysis of the LED in the Coleman LED Campsite Marker Light.
Spectrographic analysis of the yellow-green LED in the Light-Up Halloween Necklace.
Spectrographic analysis of a Radio Shack 3mm yellow-green LED from the #276-1322 assortment pack.
Spectrographic analysis of a Radio Shack yellow-green LED from the #276-1322 assortment pack.
Spectrographic analysis of the LED in the Shrek Ear-Clip Knight Light.
Spectrographic analysis of a 5mm yellow-green LED.
Spectrographic analysis of a yellow-green LED with a somewhat rectangular profile.
Spectrographic analysis of a yellow-green 5mm LED.
Spectrographic analysis of a very old yellow-green LED.
Here is a photograph of the actual LED used for this test.
Spectrographic analysis of a red/green Radio Shack bicolor LED (green).
"Original chemistry" yellow-green LED.