Measurement and Analysis of Blue-Violet Light Emitting Spectrum on Tiny Cubic Boron Nitride Crystal
LIU Hai-bo1，JIA Gang1*，XU Zhong-hui2，MENG Qing-ju1，SUN Xiao-bing3
1. State Key Laboratory of Integrated Optical-electronics, College of Electronic Science and Engineering, Jilin University, Changchun 130012, China 2. College of Electronic Engineering, Heilongjiang University, Harbin 850010, China 3. College of Optical and Electronical Information Technology, Changchun University of Science and Technology，Changchun 130012, China
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 (4.7×106 V·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 Γ 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.
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