期刊
CHEMISTRY OF MATERIALS
卷 29, 期 14, 页码 5965-5973出版社
AMER CHEMICAL SOC
DOI: 10.1021/acs.chemmater.7b01609
关键词
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资金
- Royal Society of New Zealand under the Marsden Fund [E2646/3416]
- Rutherford Discovery Fellowship [E2675/2990]
Perovskite nanocrystals have shown great promise as the basis of a new family of nanocrystal light-emitting diodes (LEDs). However, the external quantum efficiency and color stability of these materials still lag behind those of well-established technologies. Producing stable efficient red emitters with electroluminescence (EL) in the pure red range of 620-650 nm is a particular challenge. Here we present mixed halide CsPbBr3-xXx (X = I or Cl) peNC organic LEDs using peNC emitters with photoluminescence across the visible region to produce LEDs displaying EL across the-visible spectrum. By focusing on the yellow-orange to deep red (560-680 nm) visible regime, we present evidence that field-driven halide separation in CsPbBr3-xIx peNCs is responsible for the observed red-shifting and splitting of the EL peaks. Greater compositional stability is demonstrated to be the key to higher efficiency, long-lived devices for deep red-emitting mixed halide peNCs with higher compositional concentrations of iodide.
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