A solution-processable inorganic hole injection layer that improves the performance of quantum-dot light-emitting diodes

Sang Moo Lee; Dongguen Shin; Nam Kwang Cho; Yeonjin Yi; Seong Jun Kang

doi:10.1016/j.cap.2016.12.024

A solution-processable inorganic hole injection layer that improves the performance of quantum-dot light-emitting diodes

Sang Moo Lee, Dongguen Shin, Nam Kwang Cho, Yeonjin Yi, Seong Jun Kang

Department of Physics

Research output: Contribution to journal › Article › peer-review

33 Citations (Scopus)

Abstract

Solution-processable vanadium oxide (V₂O₅) was used as an inorganic hole injection layer (HIL) to improve the performance and stability of quantum-dot light-emitting diodes (QLEDs). Non-acidic and non-hygroscopic V₂O₅ solution was synthesized and spin-coated onto indium-tin-oxide (ITO)/glass substrate to serve as an HIL for QLEDs. QLEDs with a V₂O₅ HIL showed efficient hole injection and had improved luminous efficiency and life-time. Maximum luminance and luminous efficiency of QLEDs fabricated under ambient conditions were 12,603 cd/m² and 2.96 Cd/A, respectively. Photoelectron spectroscopy measurements were conducted to construct an energy level diagram of the QLEDs, and we found that the gap states of V₂O₅ enabled efficient hole-injection from ITO into the devices through the V₂O₅ HIL, resulting in enhanced luminance. These results suggest that solution-processable V₂O₅ is a feasible alternative to organic HILs for high-performance QLEDs.

Original language	English
Pages (from-to)	442-447
Number of pages	6
Journal	Current Applied Physics
Volume	17
Issue number	4
DOIs	https://doi.org/10.1016/j.cap.2016.12.024
Publication status	Published - 2017 Apr 1

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Publisher Copyright:
© 2017 Elsevier B.V.

All Science Journal Classification (ASJC) codes

Materials Science(all)
Physics and Astronomy(all)

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10.1016/j.cap.2016.12.024

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title = "A solution-processable inorganic hole injection layer that improves the performance of quantum-dot light-emitting diodes",

abstract = "Solution-processable vanadium oxide (V2O5) was used as an inorganic hole injection layer (HIL) to improve the performance and stability of quantum-dot light-emitting diodes (QLEDs). Non-acidic and non-hygroscopic V2O5 solution was synthesized and spin-coated onto indium-tin-oxide (ITO)/glass substrate to serve as an HIL for QLEDs. QLEDs with a V2O5 HIL showed efficient hole injection and had improved luminous efficiency and life-time. Maximum luminance and luminous efficiency of QLEDs fabricated under ambient conditions were 12,603 cd/m2 and 2.96 Cd/A, respectively. Photoelectron spectroscopy measurements were conducted to construct an energy level diagram of the QLEDs, and we found that the gap states of V2O5 enabled efficient hole-injection from ITO into the devices through the V2O5 HIL, resulting in enhanced luminance. These results suggest that solution-processable V2O5 is a feasible alternative to organic HILs for high-performance QLEDs.",

author = "Lee, {Sang Moo} and Dongguen Shin and Cho, {Nam Kwang} and Yeonjin Yi and Kang, {Seong Jun}",

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AU - Shin, Dongguen

AU - Cho, Nam Kwang

AU - Yi, Yeonjin

AU - Kang, Seong Jun

PY - 2017/4/1

Y1 - 2017/4/1

N2 - Solution-processable vanadium oxide (V2O5) was used as an inorganic hole injection layer (HIL) to improve the performance and stability of quantum-dot light-emitting diodes (QLEDs). Non-acidic and non-hygroscopic V2O5 solution was synthesized and spin-coated onto indium-tin-oxide (ITO)/glass substrate to serve as an HIL for QLEDs. QLEDs with a V2O5 HIL showed efficient hole injection and had improved luminous efficiency and life-time. Maximum luminance and luminous efficiency of QLEDs fabricated under ambient conditions were 12,603 cd/m2 and 2.96 Cd/A, respectively. Photoelectron spectroscopy measurements were conducted to construct an energy level diagram of the QLEDs, and we found that the gap states of V2O5 enabled efficient hole-injection from ITO into the devices through the V2O5 HIL, resulting in enhanced luminance. These results suggest that solution-processable V2O5 is a feasible alternative to organic HILs for high-performance QLEDs.

AB - Solution-processable vanadium oxide (V2O5) was used as an inorganic hole injection layer (HIL) to improve the performance and stability of quantum-dot light-emitting diodes (QLEDs). Non-acidic and non-hygroscopic V2O5 solution was synthesized and spin-coated onto indium-tin-oxide (ITO)/glass substrate to serve as an HIL for QLEDs. QLEDs with a V2O5 HIL showed efficient hole injection and had improved luminous efficiency and life-time. Maximum luminance and luminous efficiency of QLEDs fabricated under ambient conditions were 12,603 cd/m2 and 2.96 Cd/A, respectively. Photoelectron spectroscopy measurements were conducted to construct an energy level diagram of the QLEDs, and we found that the gap states of V2O5 enabled efficient hole-injection from ITO into the devices through the V2O5 HIL, resulting in enhanced luminance. These results suggest that solution-processable V2O5 is a feasible alternative to organic HILs for high-performance QLEDs.

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A solution-processable inorganic hole injection layer that improves the performance of quantum-dot light-emitting diodes

Abstract

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