Erbium-doped Si nanocrystals:: optical properties and electroluminescent devices
Erbium-doped Si nanocrystals:: optical properties and electroluminescent devices
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DOI：
10.1016/s1386-9477(02)00615-x
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发表时间：
2003-03-01
影响因子：
3.3
通讯作者：
Priolo, F
中科院分区：
文献类型：
--
作者：
Pacifici, D;Irrera, A;Priolo, F
在过去的十年里，人们一直致力于实现硅的高效发光。在不同的方法中，稀土掺杂和硅纳米结构中的量子限制显示出了巨大的潜力。本文将对SiO_2中低维硅结构的合成和性质进行分析。所有这些结构都表现出很强的室温光发射，可以通过改变晶体尺寸在可见光下进行调节。此外，镶嵌在二氧化硅中的硅纳米晶(NC)与Er离子一起显示出与稀土的强烈耦合。事实上，每个硅纳米管都会吸收能量，然后能量优先传递给附近的Er离子。这种相互作用的特征是，相对于纯氧化物基质，在Si-NC存在下，Er离子的激发截面显著增加。我们将展示掺Er的Si-Ne在Si/SiO_2法布里-珀罗微腔中的性质。可以获得非常窄、强烈和高度定向的发光峰。此外，还研究了MOS器件中Si-Ne和掺Er的Si-NC的电致发光特性。结果表明，由于纳米硅对稀土的敏化作用，可以在较低的电压下实现有效的载流子注入，并获得较强的室温电致发光信号。将介绍这些数据，并讨论其对未来应用的影响。(C)2002 Elsevier Science B.V.保留所有权利。
In the last decade, a strong effort has been devoted towards the achievement of efficient light emission from silicon. Among the different approaches, rare-earth doping and quantum confinement in Si nanostructures have shown great potentialities. In the present work, the synthesis and properties of low-dimensional silicon structures in SiO2 will be analyzed. All of these structures present a strong room temperature optical emission, tunable in the visible by changing the crystal size. Moreover, Si nanocrystals (nc) embedded in SiO2 together with Er ions show a strong coupling with the rare earth. Indeed each Si nc absorbs energy which is then preferentially transferred to the nearby Er ions. The signature of this interaction is the strong increase of the excitation cross section for an Er ion in the presence of Si nc with respect to a pure oxide host. We will show the properties of Er-doped Si ne embedded within Si/SiO2 Fabry-Perot microcavities. Very narrow, intense and highly directional luminescence peaks can be obtained. Moreover, the electroluminescence (EL) properties of Si ne and Er-doped Si nc in MOS devices are investigated. It is shown that an efficient carrier injection at low voltages and quite intense room temperature EL signals can be achieved, due to the sensitizing action of Si nc for the rare earth. These data will be presented and the impact on future applications discussed. (C) 2002 Elsevier Science B.V. All rights reserved.