Stimulated blue emission in reconstituted films of ultrasmall silicon nanoparticles

被引：152

作者：

Nayfeh, MH ^{[1
]}

Barry, N ^{[1
]}

Therrien, J ^{[1
]}

Akcakir, O ^{[1
]}

Gratton, E ^{[1
]}

Belomoin, G ^{[1
]}

机构：

[1] Univ Illinois, Dept Phys, Urbana, IL 61801 USA

来源：

APPLIED PHYSICS LETTERS | 2001年 / 78卷 / 08期

关键词：

D O I：

10.1063/1.1347398

中图分类号：

O59 [应用物理学];

学科分类号：

摘要：

We dispersed electrochemical etched Si into a colloid of ultrabright blue luminescent nanoparticles (1 nm in diameter) and reconstituted it into films or microcrystallites. When the film is excited by a near-infrared two-photon process at 780 nm, the emission exhibits a sharp threshold near 10(6) W/cm(2), rising by many orders of magnitude, beyond which a low power dependence sets in. Under some conditions, spontaneous recrystallization forms crystals of smooth shape from which we observe collimated beam emission, pointing to very large gain coefficients. The results are discussed in terms of population inversion, produced by quantum tunneling or/and thermal activation, and stimulated emission in the quantum confinement-engineered Si-Si phase found only on ultrasmall Si nanoparticles. The Si-Si phase model provides gain coefficients as large as 10(3)-10(5) cm(-1). (C) 2001 American Institute of Physics.

引用

页码：1131 / 1133

页数：3

共 17 条

[1] Detection of luminescent single ultrasmall silicon nanoparticles using fluctuation correlation spectroscopy [J].