Unknown

Dataset Information

0

Dismantling the "Red Wall" of Colloidal Perovskites: Highly Luminescent Formamidinium and Formamidinium-Cesium Lead Iodide Nanocrystals.


ABSTRACT: Colloidal nanocrystals (NCs) of APbX3-type lead halide perovskites [A = Cs+, CH3NH3+ (methylammonium or MA+) or CH(NH2)2+ (formamidinium or FA+); X = Cl-, Br-, I-] have recently emerged as highly versatile photonic sources for applications ranging from simple photoluminescence down-conversion (e.g., for display backlighting) to light-emitting diodes. From the perspective of spectral coverage, a formidable challenge facing the use of these materials is how to obtain stable emissions in the red and infrared spectral regions covered by the iodide-based compositions. So far, red-emissive CsPbI3 NCs have been shown to suffer from a delayed phase transformation into a nonluminescent, wide-band-gap 1D polymorph, and MAPbI3 exhibits very limited chemical durability. In this work, we report a facile colloidal synthesis method for obtaining FAPbI3 and FA-doped CsPbI3 NCs that are uniform in size (10-15 nm) and nearly cubic in shape and exhibit drastically higher robustness than their MA- or Cs-only cousins with similar sizes and morphologies. Detailed structural analysis indicated that the FAPbI3 NCs had a cubic crystal structure, while the FA0.1Cs0.9PbI3 NCs had a 3D orthorhombic structure that was isostructural to the structure of CsPbBr3 NCs. Bright photoluminescence (PL) with high quantum yield (QY > 70%) spanning red (690 nm, FA0.1Cs0.9PbI3 NCs) and near-infrared (near-IR, ca. 780 nm, FAPbI3 NCs) regions was sustained for several months or more in both the colloidal state and in films. The peak PL wavelengths can be fine-tuned by using postsynthetic cation- and anion-exchange reactions. Amplified spontaneous emissions with low thresholds of 28 and 7.5 ?J cm-2 were obtained from the films deposited from FA0.1Cs0.9PbI3 and FAPbI3 NCs, respectively. Furthermore, light-emitting diodes with a high external quantum efficiency of 2.3% were obtained by using FAPbI3 NCs.

SUBMITTER: Protesescu L 

PROVIDER: S-EPMC5800405 | biostudies-literature | 2017 Mar

REPOSITORIES: biostudies-literature

altmetric image

Publications

Dismantling the "Red Wall" of Colloidal Perovskites: Highly Luminescent Formamidinium and Formamidinium-Cesium Lead Iodide Nanocrystals.

Protesescu Loredana L   Yakunin Sergii S   Kumar Sudhir S   Bär Janine J   Bertolotti Federica F   Masciocchi Norberto N   Guagliardi Antonietta A   Grotevent Matthias M   Shorubalko Ivan I   Bodnarchuk Maryna I MI   Shih Chih-Jen CJ   Kovalenko Maksym V MV  

ACS nano 20170303 3


Colloidal nanocrystals (NCs) of APbX<sub>3</sub>-type lead halide perovskites [A = Cs<sup>+</sup>, CH<sub>3</sub>NH<sub>3</sub><sup>+</sup> (methylammonium or MA<sup>+</sup>) or CH(NH<sub>2</sub>)<sub>2</sub><sup>+</sup> (formamidinium or FA<sup>+</sup>); X = Cl<sup>-</sup>, Br<sup>-</sup>, I<sup>-</sup>] have recently emerged as highly versatile photonic sources for applications ranging from simple photoluminescence down-conversion (e.g., for display backlighting) to light-emitting diodes. From  ...[more]

Similar Datasets

| S-EPMC10041645 | biostudies-literature
| S-EPMC4538456 | biostudies-literature
| S-EPMC8552230 | biostudies-literature
| S-EPMC5301192 | biostudies-literature
| S-EPMC9082626 | biostudies-literature
| S-EPMC5913260 | biostudies-literature
| S-EPMC5569666 | biostudies-literature
| S-EPMC10580314 | biostudies-literature
| S-EPMC8280716 | biostudies-literature
| S-EPMC6251342 | biostudies-literature