Institute of Chemistry, The Hebrew University of Jerusalem, Jerusalem 91904, Israel.
The Center for Nanoscience and Nanotechnology, The Hebrew University of Jerusalem, Jerusalem 91904, Israel.
Nano Lett. 2021 Dec 8;21(23):10032-10039. doi: 10.1021/acs.nanolett.1c03719. Epub 2021 Nov 22.
Indium phosphide (InP) nanocrystals are emerging as an alternative to heavy metal containing nanocrystals for optoelectronic applications but lag behind in terms of synthetic control. Herein, luminescent wurtzite InP nanocrystals with narrow size distribution were synthesized via a cation exchange reaction from hexagonal CuP nanocrystals. A comprehensive surface treatment with NOBF was performed, which removes excess copper while generating stoichiometric In/P nanocrystals with fluoride surface passivation. The attained InP nanocrystals manifest a highly resolved absorption spectrum with a narrow emission line of 80 meV, and photoluminescence quantum yield of up to 40%. Optical anisotropy measurements on ensemble and single particle bases show the occurrence of polarized transitions directly mirroring the anisotropic wurtzite lattice, as also manifested from modeling of the quantum confined electronic levels. This shows a green synthesis path for achieving wurtzite InP nanocrystals with desired optoelectronic properties including color purity and light polarization with potential for diverse optoelectronic applications.
磷化铟（InP）纳米晶作为光电应用中含重金属纳米晶的替代品而崭露头角，但在合成控制方面仍存在不足。在此，通过六方 CuP 纳米晶的阳离子交换反应合成了具有窄尺寸分布的发光纤锌矿 InP 纳米晶。对其进行了全面的 NOBF 表面处理，该处理去除了多余的铜，同时生成了具有氟化物表面钝化的化学计量比的 In/P 纳米晶。所获得的 InP 纳米晶具有高分辨率的吸收光谱，其发射线宽度为 80 毫电子伏特，光致发光量子产率高达 40%。基于集合体和单个粒子的各向异性测量表明，发生了偏振跃迁，直接反映了各向异性纤锌矿晶格，这也可以从量子限制电子能级的建模中得到证实。这为实现具有所需光电性能（包括颜色纯度和光偏振）的纤锌矿 InP 纳米晶提供了一种绿色合成途径，有望在各种光电应用中得到应用。
