Rod-shaped Zn-Ag-In-Te nanocrystals with wavelength-tunable band-edge photoluminescence in the near-IR region
Rod-shaped Zn-Ag-In-Te nanocrystals with wavelength-tunable band-edge photoluminescence in the near-IR region
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DOI：
10.1039/c7tc05624a
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发表时间：
2018-02-28
影响因子：
6.4
通讯作者：
Torimoto, Tsukasa
中科院分区：
文献类型：
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作者：
Kameyama, Tatsuya;Sugiura, Kouta;Torimoto, Tsukasa
在十二烷硫醇溶液中合成了由ZnTe-AgInTe 2固溶体（（阿金）（x）Zn 2（1-x）Te 2，ZAITe）组成的棒状纳米晶（NC）。得到的宽度为4-5 nm和长度为16-18 nm的ZAITe NC在吸收光谱中显示出激子峰，而与它们的组成无关。通过将NC的x值从1.0减小到0.25，能隙从1.2增大到1.6eV。在x值为1.0-0.5的NC的每个PL光谱中观察到尖锐的光致发光（PL）峰，其可归因于带边发射，而x = 0.25的NC由于NC的非化学计量比增加而显示出源自缺陷位点的另外的宽PL峰。随着x从1.0减小到0.25，近红外区的带边PL峰从1010蓝移到809 nm，伴随着相应的PL量子产率从47%减小到0.07%，这是由于辐射复合率的减小。
Rod-shaped nanocrystals (NCs) composed of ZnTe-AgInTe2 solid solution ((AgIn)(x)Zn2(1-x)Te2, ZAITe) were synthesized in a 1-dodecanethiol solution. The resulting ZAITe NCs of 4-5 nm in width and 16-18 nm in length showed exciton peaks in the absorption spectra, regardless of their composition. The energy gap was enlarged from 1.2 to 1.6 eV by decreasing the x value of the NCs from 1.0 to 0.25. A sharp photoluminescence (PL) peak was observed in each PL spectrum of the NCs with x values of 1.0-0.5, assignable to band-edge emission, while NCs with x = 0.25 showed an additional broad PL peak originating from the defect sites due to the increased non-stoichiometry of NCs. With a decrease in x from 1.0 to 0.25, the band-edge PL peak was blue-shifted from 1010 to 809 nm in the near-IR region, accompanied by a decrease in the corresponding PL quantum yield from 47% to 0.07% due to the diminution of radiative recombination rate.