Investigation of Dislocations Inducing Leakage Current on SiC Junction Barrier Schottky Diode by Two-Photon-Excited Band-Edge Photoluminescence

Tilt angles of threading dislocations (TDs) which induce leakage of current on SiC junction barrier schottky diodes (SiC-JBSs) were investigated by two-photon-excited photoluminescence (2PPL) and transmission electron microscopy (TEM). Observation of leakage spots measured by atomic force microscopy (AFM) revealed that pit-like structures were certainly formed but the depths were considerably shallow, indicating that influence of local electric field due to the structures was negligible on our SiC-JBSs. It became clear that tilt angles of the TDs inducing leakage were relatively larger than about 11° by 2PPL and that the TD was the threading mixed dislocation by TEM.

New levels in spherical 96Y

New transitions in neutron rich [Formula: see text]Y have been identified by analyzing the high statistics [Formula: see text]-[Formula: see text]-[Formula: see text] and [Formula: see text]-[Formula: see text]-[Formula: see text]-[Formula: see text] coincidence data from the spontaneous fission of [Formula: see text]Cf at the Gammasphere detector array. Shell model calculations were performed and are found in good agreement with experimental data. The ground state is nearly spherical but a new excited band has large deformation.

Possible very anharmonic one- and two-phonon γ-vibrational bands in 103Mo

High-spin levels of [Formula: see text]Mo have been reinvestigated by analyzing the high statistics [Formula: see text]-[Formula: see text]-[Formula: see text] and [Formula: see text]-[Formula: see text]-[Formula: see text]-[Formula: see text] coincidence data from the spontaneous fission of [Formula: see text]Cf taken with the Gammasphere detector array. Two bands and 30 new transitions have been identified. A potential energy surface calculation has been performed. The calculation confirmed the 3/2[Formula: see text][411] configuration of the ground state band and 5/2[Formula: see text][532] for the 346[Formula: see text]keV excited band, as assigned in the previous work. The two newly established bands were proposed to be one- and two-phonon [Formula: see text] vibrational bands coupling to the 5/2[Formula: see text][532] Nilsson orbital, respectively. Triaxial projected shell model calculations have been applied to explain the level structure and are found in good agreement with experimental data.

Three-Dimensional Imaging of Extended Defects in 4H-SiC by Two-Photon-Excited Band-Edge Photoluminescence

This paper demonstrates three-dimensional imaging of threading screw dislocations (TSDs) and threading edge dislocations (TEDs) in 4H-SiC using two-photon-excited photoluminescence (2PPL) band-edge emission. Three-dimensional (3D) images of TSDs and TEDs are successfully obtained as dark contrasts on a bright background of band-edge emission. The intensity inversion of a 2PPL 3D image yields a perspective to visually examine the propagation behavior of dislocations. The tilt angles of TEDs are also measured and shown to correlate with the directions of the extra half planes of TEDs.

NORMALIZATION OF WAVE FUNCTION OF THE BAND STATES

Low – lying band states are one of the most fundamental excitation modes in the energy spectra of deformed nuclei. Present paper a theoretically analysis the properties of deformed nucley within the phenomenological model (Usmanov 2010). The normalization of the wave functions of low – lying excited band states are calculated.

Effect of RE3+ Codopant on Afterglow Time of SrS:Eu2+,RE3+

The longest afterglow time of an orange-red- emitting SrS:Eu2+,Pr3+ afterglow phosphor by visible light irradiation was about 1010 minutes was previously achieved by varying the synthetic conditions such as amount of Li+ added, reduction temperature, reduction time, and initial Eu/Sr and Pr/Sr atomic ratios in previous paper. Therefore, this study reports on the effect of the RE3+ codopants on the afterglow time of an orange-red-emitting SrS phosphor by visible light irradiation. SrSO4:Eu3+,RE3+(RE3+ = Tm3+, Er3+, Tb3+, Nd3+, Pr3+, Ce3+, and La3+), which was the precursor for SrS phosphors, was synthesized via a liquid-phase reaction. SrSO4:Eu3+,RE3+ was pressurized at 10 MPa for a few minutes to form a compact, which was then heated under a H2S or Ar-H2 (5 mol%) reductive atmosphere at 1400 °C for 2.5 h to generate the SrS:Eu3+,RE3+ afterglow phosphor. The emission color of the SrS:Eu2+,RE3+ afterglow phosphor was orange-red and its emission peak was observed around 610 nm. The excited band of the phosphor was in the range of visible light more than 440 nm. The emission and excitation spectra of the SrS:Eu2+,RE3+ afterglow phosphor were not dependent on the RE3+ codopants. However, the afterglow time of SrS:Eu2+,RE3+ phosphor was increased with the increase of ionic radius of the coactivator. The longest afterglow time of SrS:Eu2+,Ce3+ phosphor by irradiating for 5 minutes at 1000 lx which was created from a D65 lamp was 1376 minutes. This was 9.5 times longer than that of a commercial available phosphor (CaS:Eu2+,Tm3+).