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Strong Green Photoluminescence in Zr3N4 Thin Films with an Orthorhombic Structure
The Journal of Physical Chemistry C ( IF 3.7 ) Pub Date : 2023-03-15 , DOI: 10.1021/acs.jpcc.2c08623
Yuhe Liu, Nina Ge, Kunlun Wang, Niannian Li, Hui Sun, Jean-Francois Pierson, Bo Dai, Yong Wang

Green light causes the maximum luminous sensation in human eyes, which has many advantages for potential uses. However, the efficiency of light-emitting diodes (LEDs) in the green wavelength range (495–570 nm) is much lower than that in the red or blue region, which is known as the “green gap” problem. In this study, we report the strong green photoluminescence in metastable Zr3N4 thin films with an orthorhombic structure for the first time. Crystallized Zr3N4 thin films have been successfully grown by high-power impulse magnetron sputtering. Notable green photoluminescence in the wavelength region of 490–535 nm has been identified in such orthorhombic Zr3N4 thin films even at room temperature. In addition, a joint experimental and theoretical study has been performed to investigate its electronic structures and to reveal the origins of such green light emissions. The calculations of the transition dipole moments demonstrate that the direct transition between the conduction band minimum and the energy level II below the valence band maximum is responsible for such strong green photoluminescence. This work may pave a new way to solve the “green gap” problem in LEDs with low cost.

中文翻译:

具有正交结构的 Zr3N4 薄膜中的强绿色光致发光

绿光在人眼中产生最大的光感,具有许多潜在用途的优点。然而,发光二极管 (LED) 在绿色波长范围 (495–570 nm) 的效率远低于红色或蓝色区域的效率,这被称为“绿色差距”问题。在这项研究中,我们首次报道了具有正交结构的亚稳态 Zr 3 N 4薄膜中的强绿色光致发光。结晶Zr 3 N 4薄膜已通过高功率脉冲磁控溅射成功生长。在这种斜方晶系 Zr 3 N 4中,已经在 490–535 nm 的波长范围内发现了显着的绿色光致发光即使在室温下也能形成薄膜。此外,还进行了一项联合实验和理论研究,以研究其电子结构并揭示这种绿光发射的起源。跃迁偶极矩的计算表明,导带最小值和价带最大值以下的能级 II 之间的直接跃迁是造成这种强烈的绿色光致发光的原因。这项工作可能为低成本解决 LED 中的“绿色差距”问题铺平道路。
更新日期:2023-03-15
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