Electroluminescence from electron injection junctions created by carbon and phosphorus ion implantation

A p-type (type IIb) natural diamond was implanted with either carbon or phosphorus ions using the cold implantation rapid annealing (CIRA) process. In each case, the energies and doses were chosen such that upon annealing, the implanted layer would act as an n-type electrode. The electroluminescence (EL) emitted from these carbon and phosphorus junctions, when biased in the forward direction, was compared as a function of annealing and diode temperatures. Typical luminescence bands such as those observed in cathodoluminescence (CL), in particular a blue band A (approximate to 2.9 eV) and a green band (approximate to 2.4 eV), were observed. Two bands centred around approximate to 2.1 and 4 eV were also observed for both the carbon and phosphorus junctions, whereas a band at approximate to 4.45 eV appeared only in the phosphorus-implanted junction. (C) 1999 Elsevier Science S.A. All rights reserved.