Title

Highly Efficient Broadband Yellow Phosphor Based on Zero-Dimensional Tin Mixed-Halide Perovskite

Abstract

Organic-inorganic hybrid metal halide perovskites have emerged as a highly promising class of light emitters, which can be used as phosphors for optically pumped white light-emitting diodes (WLEDs). By controlling the structural dimensionality, metal halide perovskites can exhibit tunable narrow and broadband emissions from the free-exciton and self-trapped excited states, respectively. Here, we report a highly efficient broadband yellow light emitter based on zero-dimensional tin mixed-halide perovskite (C4N2H14Br)4SnBrxI6-x (x = 3). This rare-earth-free ionically bonded crystalline material possesses a perfect host-dopant structure, in which the light-emitting metal halide species (SnBrxI6-x4-, x = 3) are completely isolated from each other and embedded in the wide band gap organic matrix composed of C4N2H14Br-. The strongly Stokes-shifted broadband yellow emission that peaked at 582 nm from this phosphor, which is a result of excited state structural reorganization, has an extremely large full width at half-maximum of 126 nm and a high photoluminescence quantum efficiency of ∼85% at room temperature. UV-pumped WLEDs fabricated using this yellow emitter together with a commercial europium-doped barium magnesium aluminate blue phosphor (BaMgAl10O17:Eu2+) can exhibit high color rendering indexes of up to 85.

Document Type

Article

DOI

https://doi.org/10.1021/acsami.7b12862

Keywords

perovskite, lead-free, od structure, yellow phosphor, white leds

Publication Date

2017

Recommended Citation

Zhou, Chenkun, Yu Tian, Zhao Yuan, Haoran Lin, Banghao Chen, Ronald Clark, Tristan Dilbeck et al. "Highly efficient broadband yellow phosphor based on zero-dimensional tin mixed-halide perovskite." ACS applied materials & interfaces 9, no. 51 (2017): 44579-44583.

Journal Title

ACS applied materials & interfaces

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