Photoluminescence from Silicon Nanocrystals in Encapsulating Materials

Naturally oxidized freestanding silicon nanocrystals （Si NCs） are incorporated in commonly used encapsulating materials to explore the photoluminescent application of Si NCs in device structures such as solid-state lighting light-emitting diodes （LEDs） and solar cells. The quantum yield of Si NCs be...

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Bibliographic Details
Published in:Journal of materials science & technology 2013-03, Vol.29 (3), p.221-224
Main Authors: Deng, Z., Pi, X.D., Zhao, J.J., Yang, D.
Format: Article
Language:English
Subjects:
Curing
Encapsulating
Epoxy
Excitation
External quantum efficiency
Illumination
Nanocrystals
Photoluminescence
Quantum yield
Silicon
Silicon nanocrystals
Silicone
Wavelengths
光致
发光二极管
发光硅
外部量子效率
太阳能电池
封装材料
激发波长
硅纳米晶
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Summary:Naturally oxidized freestanding silicon nanocrystals （Si NCs） are incorporated in commonly used encapsulating materials to explore the photoluminescent application of Si NCs in device structures such as solid-state lighting light-emitting diodes （LEDs） and solar cells. The quantum yield of Si NCs before the incorporation has reached about 45% at the excitation wavelength of 370 nm without any special surface modification. It is found that medium Ioadings, e.g., 5 wt% of Si NCs in encapsulating materials help to obtain high external quantum efficiency （EQE） of the mixtures of Si NCs and encapsulating materials. The curing of encapsulating materials significantly reduces EQE. Among all the encapsulating materials investigated in this work, silicone- OE6551 enables the highest EQE （21% at excitation wavelength λex = 370 nm） after curing. Based on current findings, we have discussed the continuous efforts to advance the photoluminescent application of Si NCs.
ISSN:1005-0302
1941-1162
DOI:10.1016/j.jmst.2013.01.006