Light emitting diodes: an introduction

3,742,356 6/1973 Brock ............................. 324/158 D 3,870,953 3/1975 Boatman et al. ................ 324/158 T 3,978,405 8/1976 Petree.................................. 324/158 4,215,309 7/1980 Frey .................................... 324/158 4,301,403 11/1981 Hawkes et al. ....................... 324/62 4,307,342 12/1981 Peterson .............................. 324/158 4,489,477 12/1984 Chik et al.............................. 29/569 4,578,641 3/1986 Tiedje ................................. 324/158 4,611,116 9/1986 Batt ..................................... 250/239 4,775,640 10/1988 Chan ....................................... 437/8 4,797,609 l/1989 Yang ................................... 324/58 5,047,711 9/1991 Smith et al.......................... 324/158 5,065,007 11/1991 Tanaka ....... 5,303,905 7/1991 Figal .............................. ... 250/215 ...... 324/158 USOO5381103A