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oe1(光电查) - 科学论文

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  • Physical, structural, thermal and spectroscopic investigation of Sm2O3 doped LAB glasses for orange LED

    摘要： In this article, Sm2O3 doped Lithium Alumino-borate (LABS) glasses were prepared by melt-quench technique. Physical, structural, thermal and spectroscopic properties are investigated by various techniques. The emission spectra consist of three sharp peaks at 562.5, 599, 645.5 nm within the 4f electronic configuration of Sm3+ ions and two feeble emission peaks at 691, 711 nm of Sm2+ ion at 402 nm excitation. Among all prepared glass samples, glass doped with 0.5 mol % Sm2O3 (LABS-4) shows highest emission intensity with CIE chromaticity coordinates x = 0.55 and y = 0.44 in the orange zone of the chromaticity diagram. The CIE plot and the images of glass samples show; the glass doped with 0.5 mol % Sm2O3 emit intense orange light at 402 nm excitation and can be useful for intense orange LED application.

    关键词： CIE Chromaticity,Orange emission,LABS glasses,Sm2O3,Photoluminescence

    更新于2025-09-11 14:15:04

  • Bright Orange Electroluminescence from Lead-Free Two-Dimensional Perovskites

    摘要： Lead halide perovskites are important materials for solar cells and light emitting diodes (LEDs), but the toxicity of lead is a matter of concern for these and other commercial applications. Here, we demonstrate a lead-free two-dimensional (2D) Ruddlesden-Popper-type (C18H35NH3)2SnBr4 perovskite with a strong emission from the self-trapped states, whose photoluminescence quantum yields in colloidal suspension and in film are 88% and 68%, respectively. The insulating character of the organic oleylamine cation prevents electronic band formation between the [SnBr6]4- octahedron layers, which results in the Stokes-shifted orange emission. Electroluminescence of these 2D lead-free perovskite materials was demonstrated in an inverted LED structure with a low turn-on voltage of 2.2 V and a luminance of 350 cd/m2.

    关键词： orange emission,two-dimensional perovskites,self-trapped states,lead-free,electroluminescence

    更新于2025-09-04 15:30:14