Abstract
The excitons in boron carbide recently independently proved to be present by luminescencemeasurements (by Schmechel and co-workers) and by x-ray Raman scatteringinvestigations in connection with ab initio calculations (by Feng and co-workers) arediscussed, taking the actual structure of boron carbide within the homogeneity range(B4.3C–B∼11C) into account. The excitonic levels at 1.560 and 1.5695 eV obtained from the luminescencespectrum are attributed to the central B atom in the C–B–C and the C–B–B chainsrespectively. Considering the transition energies related to the different gap statesobtained by optical and electrical measurements for energies below the interbandtransition of 2.09 eV, an actualized energy band scheme of boron carbide is presented.
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