Photoluminescence and light reabsorption in SiC quantum dots embedded in binary-polyelectrolyte solid matrix
Photoluminescence and light reabsorption in SiC quantum dots embedded in binary-polyelectrolyte solid matrix
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DOI：
10.1063/1.4764854
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发表时间：
2012-11
影响因子：
3.2
通讯作者：
N. Zhang;Dejian Dai;Wenxia Zhang;Jiyang Fan
中科院分区：
文献类型：
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作者：
N. Zhang;Dejian Dai;Wenxia Zhang;Jiyang Fan
本文报道了嵌在二元聚烯丙胺盐酸盐-聚苯乙烯磺酸钠聚电解质固体基质中的SiC量子点的光致发光和光重吸收。发射最大波长可以在宽的蓝-紫光谱区域上调谐，指示量子限制的PL起源。随着量子点在聚电解质基质中浓度的增加，最大发射峰出现红移。分析表明，这种转变源于较大的基质中的PL的小SiC量子点的重吸收。我们发现，在固体基质的表面上沉积银纳米颗粒可以显着减少由于表面等离子体诱导的入射光的浓度的光重吸收。此外，PL强度增强了1.4倍。我们的研究结果打开了基于SiC量子点的固态蓝紫外光发射器在全固态照明和显示应用的可能性。
We report photoluminescence (PL) and light reabsorption in the SiC quantum dots (QDs) embedded in the binary poly(allylamine hydrochloride)-sodium poly(styrene sulfonate) polyelectrolytes solid matrix. The emission maximum wavelength can be tuned over a wide blue-violet spectral region indicating a PL origin of quantum confinement. The emission maximum exhibits a red shift with increasing concentration of the QDs in the polyelectrolytes matrix. The analysis shows that this shift stems from reabsorption of PL of smaller SiC QDs by larger ones in the matrix. We find that deposition of Ag nanoparticles on the surface of the solid matrix can dramatically reduce light reabsorption owing to surface plasmon-induced concentration of incident light. Additionally, the PL intensity was enhanced by a factor of 1.4. Our results open the possibility of the SiC QDs-based solid blue-UV light emitters for applications in full-solid-state lighting and display.