title: [Measurement and analysis of blue-violet light emitting spectrum on tiny cubic boron nitride crystal].
abstract: The electroluminescence effect can be observed by the micro N-type wide-gap CBN semiconductor crystal under the condition of static eletric field. The micro N-type CBN crystal was fixed on the focus of the parabolic reflector of grating monochromator, and the maximum value of transmission ratio and the ideal signal-noise ratio can be obtained. Under the condition of static ectric-field intensity (4.7 x 10(6) V x cm(-1)), the blue-violet light-emitting spectrum of the CBN crystal was measured in the range from 350 to 450 nm. The construction of the CBN energy band, which was calculated with the First-principles method, the nonlinear relationship between current density and the ectric-field intensity that was measured and the phenomenon of electrical break-down were considered together to enable us to discuss the luminescence mechanism. Finally, the authors came up with the luminescence mechanism concerning electron migration from gamma energy valley to X energy valley. The large number of excited electrons we talked about were generated by polarization and breakdown of defect dipole before avalanche breakdown occurred.
authors.affiliation: State Key Laboratory of Integrated Optical-electronics, College of Electronic Science and Engineering, Jilin University, 130012 Changchun, China. liuhaibo209@163.com
authors.forename: Hai-Bo
authors.initials: HB
authors.lastname: Liu
authors.forename: Gang
authors.initials: G
authors.lastname: Jia
authors.forename: Zhong-Hui
authors.initials: ZH
authors.lastname: Xu
authors.forename: Qing-Ju
authors.initials: QJ
authors.lastname: Meng
authors.forename: Xiao-Bing
authors.initials: XB
authors.lastname: Sun