Luminescence and the light emitting diode / by E. W. Williams and R. Hall. Williams, E. W. Hall, R., joint author. Light emitting diodes. Luminescence. TK7871.89.L53 W54 1978 621.3815 WILL Includes bibliographical references and indexes. New York : Pergamon Press, c1978. c1978. 1978 Text xi, 241 p. : eng