Silicon-based nanoparticles grafted lanthanide coordination polymer phosphor: Facile synthesis, formation process and white light-emitting diodes

Abstract

White light-emitting diodes (WLEDs) are promising candidates for environment-friendly solid-state light sources, where modulation of white light has been a significant research priority. Here we achieved a new single-phase white light phosphor (Si NPs-M) by grafting silicon-based nanoparticles onto a red lanthanide coordination polymer by a simple wet chemical method. The activation of the energy transfer mechanism is controlled by changing the local site of ion coordination (by varying the Eu3+ concentration) to achieve modulation of the molecule to fine-tune its emitted chromaticity. The synthesis of a single-phase phosphor based on ultraviolet (UV) pumped and as a WLED was realized. These WLEDs demonstrate white light for color coordinates of (0.3405, 0.3682), CRI of 78, and CCT of 5210 K. In addition, the WLEDs possess good optical stability as the drive current increase from 30 mA to 300 mA, while the phosphor maintains 87.4 % of the luminous intensity when the external temperature rises to 130 °C, indicating high stability. This work has potential applications for silicon-compatible display technologies that require fine control of efficient white light emission.