Abstract An optical semiconductor device including an electroluminescent diode mounted on a support so that radiation from the diode is emitted away from the support. A glass dome is mounted on the support and covers the diode so as to be in intimate contact with the diode. The radiation emitted from the diode passes through the glass dome so as to improve the external emission efficiency of the device. The optical semiconductor device is made by mounting the electroluminescent diode on a support and then forming a glass dome over the diode with the glass dome being in intimate contact with and fused to the diode. The glass dome may be formed by placing a preformed glass bead on a heated diode and support subassembly, or by melting a glass in a mold cavity and placing the diode and support subassembly onto the soft glass while in the mold.
An optical semiconductor device in accordance with claim 1 including a support, the diode being mounted on said support so as to emit radiation away from the support and the glass dome is mounted on said support and extends over the diode.
Claim 2
Dependent Claim
37 words
An optical semiconductor device in accordance with claim 1, in which the glass of the dome includes up to 10 percent of tellurium as a replacement for a corresponding amount of the chalcogen on a molar basis.
Claim 3
Dependent Claim
37 words
An optical semiconductor device in accordance with claim 1 in which the glass of the dome includes up to 8 percent of iodine as a replacement for a corresponding amount of the bromine on a molar basis.
Claim 4
Dependent Claim
33 words
An optical semiconductor device in accordance with claim 1 in which the glass dome is of a composition consisting essentially of by weight 34 percent arsenic, 46 percent sulfur and 20 percent bromine.
Claim 5
Dependent Claim
36 words
An optical semiconductor glass in accordance with claim 1 in which the glass dome is of a composition consisting essentially of by weight 57.7 percent arsenic, 20.6 percent sulfur, 38.6 percent selenium and 15.1 percent bromine.