Recently, low-Cd-content colloidal quantum dots (QDs) have been developed to replace the conventional core/shell CdSe/ZnS QDs in lighting and displays. Due to concerns of heavy metals including Cd and Pb to the environment, scientists are also developing new synthetic methods for heavy-metal-free QDs. Among them, InP is one of the promising candidates that shows fairly high performance in both optical property and material stability. However, synthesis of InP QDs generally requires an extremely toxic phosphine precursor such as PH₃ or tris(trimethylsilyll)phosphine, which spontaneously ignites in air and can cause severe burns for human tissues. In this report, we will compare synthetic processes and material properties of InP QDs synthesized by different phosphine precursors including PH₃, tris(trimethylsilyll)phosphine and aminophosine. In particular, a facile synthetic process of InP QDs derived from aminophosine will be presented. Application of the prepared InP QDs in lighting and environmental sensing will be also investigated in this study.