All-Inorganic CsPbI3 Perovskite Phase-Stabilized by Poly(ethylene oxide) for Red-Light-Emitting Diodes

Beomjin Jeong, Hyowon Han, Yung Ji Choi, Sung Hwan Cho, Eui Hyuk Kim, Seung Won Lee, Jong Sung Kim, Chanho Park, Dongho Kim, Cheolmin Park

Research output: Contribution to journalArticle

39 Citations (Scopus)

Abstract

Despite the excellent photoelectronic properties of the all-inorganic cesium lead iodide (CsPbI3) perovskite, which does not contain volatile and hygroscopic organic components, only a few CsPbI3 devices are developed mainly owing to the frequent formation of an undesirable yellow δ-phase at room temperature. Herein, it is demonstrated that a small quantity of poly(ethylene oxide) (PEO) added to the precursor solution effectively inhibits the formation of the yellow δ-phase during film preparation, and promotes the development of a black α-phase at a low crystallization temperature. A systematic study reveals that a thin, dense, pinhole-free CsPbI3 film is produced in the α-phase and is stabilized with PEO that effectively reduces the grain size during crystallization. A thin α-phase CsPbI3 film with excellent photoluminescence is successfully employed in a light-emitting diode with an inverted configuration of glass substrate/indium tin oxide/zinc oxide/poly(ethyleneimine)/α-CsPbI3/poly(4-butylphenyl-diphenyl-amine)/WO3/Al, yielding the characteristic red emission of the perovskite film at 695 nm with brightness, external quantum efficiency, and emission band width of ≈101 cd m−2, 1.12%, and 32 nm, respectively.

Original languageEnglish
Article number1706401
JournalAdvanced Functional Materials
Volume28
Issue number16
DOIs
Publication statusPublished - 2018 Apr 18

Fingerprint

ethylene oxide
Polyethylene oxides
Perovskite
Light emitting diodes
light emitting diodes
Crystallization
Film preparation
Zinc Oxide
Cesium
Iodides
crystallization
Zinc oxide
Tin oxides
Quantum efficiency
photoelectronics
Indium
Amines
Luminance
Photoluminescence
pinholes

All Science Journal Classification (ASJC) codes

  • Electronic, Optical and Magnetic Materials
  • Biomaterials
  • Condensed Matter Physics
  • Electrochemistry

Cite this

Jeong, Beomjin ; Han, Hyowon ; Choi, Yung Ji ; Cho, Sung Hwan ; Kim, Eui Hyuk ; Lee, Seung Won ; Kim, Jong Sung ; Park, Chanho ; Kim, Dongho ; Park, Cheolmin. / All-Inorganic CsPbI3 Perovskite Phase-Stabilized by Poly(ethylene oxide) for Red-Light-Emitting Diodes. In: Advanced Functional Materials. 2018 ; Vol. 28, No. 16.
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All-Inorganic CsPbI3 Perovskite Phase-Stabilized by Poly(ethylene oxide) for Red-Light-Emitting Diodes. / Jeong, Beomjin; Han, Hyowon; Choi, Yung Ji; Cho, Sung Hwan; Kim, Eui Hyuk; Lee, Seung Won; Kim, Jong Sung; Park, Chanho; Kim, Dongho; Park, Cheolmin.

In: Advanced Functional Materials, Vol. 28, No. 16, 1706401, 18.04.2018.

Research output: Contribution to journalArticle

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AU - Jeong, Beomjin

AU - Han, Hyowon

AU - Choi, Yung Ji

AU - Cho, Sung Hwan

AU - Kim, Eui Hyuk

AU - Lee, Seung Won

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AU - Park, Chanho

AU - Kim, Dongho

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AB - Despite the excellent photoelectronic properties of the all-inorganic cesium lead iodide (CsPbI3) perovskite, which does not contain volatile and hygroscopic organic components, only a few CsPbI3 devices are developed mainly owing to the frequent formation of an undesirable yellow δ-phase at room temperature. Herein, it is demonstrated that a small quantity of poly(ethylene oxide) (PEO) added to the precursor solution effectively inhibits the formation of the yellow δ-phase during film preparation, and promotes the development of a black α-phase at a low crystallization temperature. A systematic study reveals that a thin, dense, pinhole-free CsPbI3 film is produced in the α-phase and is stabilized with PEO that effectively reduces the grain size during crystallization. A thin α-phase CsPbI3 film with excellent photoluminescence is successfully employed in a light-emitting diode with an inverted configuration of glass substrate/indium tin oxide/zinc oxide/poly(ethyleneimine)/α-CsPbI3/poly(4-butylphenyl-diphenyl-amine)/WO3/Al, yielding the characteristic red emission of the perovskite film at 695 nm with brightness, external quantum efficiency, and emission band width of ≈101 cd m−2, 1.12%, and 32 nm, respectively.

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