A simple catalysis-free approach that utilises a gas-solid reaction for the synthesis of large-scale single-crystalline PrB6nanorods using Pr and BCl3as starting materials is demonstrated. The nanorods exhibit a low turn-on electric field (2.80 V μm-1at 10 μA cm-2), a low threshold electric field (6.99 V μm-1at 1 mA cm-2), and a high current density (1.2 mA cm-2at 7.35 V μm-1) at room temperature (RT). The turn-on and threshold electric field are found to decrease clearly from 2.80 to 0.95 and 6.99 to 3.55 V μm-1, respectively, while the emission current density increases significantly from 1.2 to 13.8 mA cm-2(at 7.35 V μm-1) with an increase in the ambient temperature from RT to 623 K. The field enhancement factor, emission current density, and the dependence of the effective work function with temperature are investigated. The possible mechanism of the temperature-dependent emission from PrB6nanorods is discussed. KGaA.
ASJC Scopus subject areas
- Electronic, Optical and Magnetic Materials
- Condensed Matter Physics