期刊
CHEMISTRY OF MATERIALS
卷 21, 期 12, 页码 2459-2466出版社
AMER CHEMICAL SOC
DOI: 10.1021/cm900567g
关键词
-
资金
- National Research Foundation of Korea [핵09B1313] Funding Source: Korea Institute of Science & Technology Information (KISTI), National Science & Technology Information Service (NTIS)
Crystalline silicon is a poor UV-visible-near IR emitter because of its indirect, narrow band gap and low quantum yield of similar to 1 x 10(-2)% at room temperature. To effectively confine a photoexcited electron-hole pair (exciton) within Si's Bohr radius of similar to 5 nm, we have theoretically and experimentally explored several low-dimensional Si-based materials. Although Si-Si bonded network polysilyne was previously regarded as a soluble model polymer of amorphous Si and Si nanosheet-like saturated silagraphene, further studies on pyrolytic products of polysilyne derivatives and their inherent photophysical properties under a vacuum have not yet been reported. The present paper demonstrated visible light emission from ten soluble polysilynes in the range 460 nm (2.70 eV) to 740 nm (1.68 eV) at both 77 K and room temperature by controlling temperature and time of the pyrolysis (200-500 degrees C, 10-90 min) under a vacuum. When very weakly deep-red emitting Si particles produced by the pyrolysis of poly(n-butylsilyne) at 500 degrees C for 90 min were exposed to air, the photoluminescence switched abruptly to an intense sky-blue color (lambda = 430 nm), with a quantum yield of 20-25% and a short lifetime of similar to 5 ns in common organic solvents at room temperature because of the Siloxene-like, multilayered Si-sheet structures.
作者
我是这篇论文的作者
点击您的名字以认领此论文并将其添加到您的个人资料中。
推荐
暂无数据