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Reports from Shandong University Add New Data to Findings in Low Dimensional Structures

May 13, 2014



By a News Reporter-Staff News Editor at Physics Week -- Fresh data on Low Dimensional Structures are presented in a new report. According to news reporting originating from Jinan, People's Republic of China, by VerticalNews correspondents, research stated, "Electroluminescence (EL) spectra of blue InGaN/GaN multiple-quantum-well light-emitting diode (LED) have been investigated over a wide range of injection current (0.001-200 mA) and at various temperatures (6-300 K). Surprisingly, with increasing the injection current the EL peak energy shows an initial blueshift accompanied by a broadening of the EL linewidth at low temperatures (below 30 K)."

Our news editors obtained a quote from the research from Shandong University, "This trend differs from the usual photoluminescence (PL) measurement results, which have shown that with increasing the optical excitation power the PL peak energy gave an initial blueshift accompanied by a narrowing of the PL linewidth at low temperatures. The anomalous current behavior of the EL spectra may be attributed to electron leakage results in the failure of Coulomb screening effect and the relative enhancement of the low-energetic localized state filling at low temperatures and low currents."

According to the news editors, the research concluded: "The electron leakage for the LED is further confirmed by both the current dependence of the EL intensity and the temperature dependence of the EL efficiency."

For more information on this research see: Influence of injection current and temperature on electroluminescence in InGaN/GaN multiple quantum wells. Physica E-Low-Dimensional Systems & Nanostructures, 2014;59():56-59. Physica E-Low-Dimensional Systems & Nanostructures can be contacted at: Elsevier Science Bv, PO Box 211, 1000 Ae Amsterdam, Netherlands.

The news editors report that additional information may be obtained by contacting H.N. Wang, Shandong University, State Key Lab Crystal Mat, Jinan 250100, People's Republic of China. Additional authors for this research include Z.W. Ji, H.D. Xiao, M.Q. Wang, S. Qu, Y. Shen and X.G. Xu.

Keywords for this news article include: Asia, Jinan, People's Republic of China, Low Dimensional Structures

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Source: Physics Week