HOLONYAK, Nick, and BEVACQUA, S.F., Coherent (Visible) Light Emission from Ga(As11-xPx) Junctions ([pre-print edition], 1962)

Pre-print version of the famous 1962 Holonyak/Bevacqua paper, with associated archival material. A very nice and historically important collection relating to the invention of the Light Emitting Diode or LED, one of the most important energy efficient technologies of the twentieth century:

When something glows from being heated, it emits light in all parts of the spectrum, but will always peak somewhere. For household lamps that still use glowing metal filaments, the bulbs all peak in the infrared, which is the single greatest contributor to their inefficiency as a source of visible light. Our senses detect infrared only in the form of warmth on our skin. The LED revolution in advanced lighting technology creates pure visible light without wasting wattage on invisible parts of the spectrum. That s how you can get crazy-sounding sentences like: '7 Watts LED replaces 60 Watts Incandescent' on the packaging. (Neil deGrasse Tyson, Astrophysics for People in a Hurry)

The Holonyak/Bevacqua paper was published in Applied Physics Letters 1 (December 1962), pp. 82-83. The standard work on the subject describes this paper as follows:

The beginning of visible-spectrum LEDs dates back to the year 1962 when Holonyak and Bevacqua reported on the emission of coherent visible light from GaAsP junctions in the first volume of Applied Physics Letters. (Schubert, Light Emitting Diodes, p.8)

The paper is contained in a folder with associated archival material, including one other related preprint and some later commercial materials. Very good condition, noting some fragile cheap paper used for some of the archival material.