DOI: 10.1063/1.1819991. Memory effect from charge trapping in layered organic structures

Memory effect from charge trapping in layered organic structures

10.1063/1.1819991

Crossref journal-article

AIP Publishing

Applied Physics Letters (317)

Abstract

We demonstrate organic light emitting devices (OLEDs) with a charge trap layer that show memory behavior. These OLEDs demonstrate that organic heterojunction structures can controllably trap and release electronic charges. The trap layer is either 5-nm-thick clustered silver islands, or a 10-nm-thick organic laser dye DCM2 ([2-methyl-6-[2-(2,3,6,7-tetrahydro-1H,5H-benzo[i,j]quinolizin-9-yl)-ethenyl]-4H-pyran-4-ylidene] propane-dinitrile) doped into TPD (N,N′-diphenyl-N,N′-bis(3-methylphenyl)-1,1′-biphenyl-4,4′-diamine). Predictions of the energy band structure indicate that both DCM2 sites and the metal islands can trap charge, consistent with the measured current–voltage characteristics. Trap sites are charged by applying reverse bias over the OLEDs. For devices with DCM2 traps we observe quenching of DCM2 photoluminescence upon charging, which allows us to quantify the charged trap density as approximately 10% of the trap sites or 1018cm−3. From time resolved measurements we observe that the charge retention time exceeds 2h.

Bibliography

Kang, S. H., Crisp, T., Kymissis, I., & BuloviÄ, V. (2004). Memory effect from charge trapping in layered organic structures. Applied Physics Letters, 85(20), 4666â4668.

Authors 4

Sung Hoon Kang (first)
Todd Crisp (additional)
Ioannis Kymissis (additional)
Vladimir Bulović (additional)

References 7 Referenced 53

10.1103/PhysRev.103.1648 / Phys. Rev. (1956)
10.1103/PhysRevLett.91.247403 / Phys. Rev. Lett. (2003)
10.1063/1.362350 / J. Appl. Phys. (1996)
10.1063/1.1473234 / Appl. Phys. Lett. (2002)
10.1063/1.1643547 / Appl. Phys. Lett. (2004)
10.1063/1.369373 / J. Appl. Phys. (1999)
10.1016/S0379-6779(99)00358-6 / Synth. Met. (2000)

Dates

Type	When
Created	20 years, 9 months ago (Nov. 16, 2004, 6:03 p.m.)
Deposited	1 year, 7 months ago (Feb. 3, 2024, 11:30 p.m.)
Indexed	5 months ago (April 1, 2025, 3:44 a.m.)
Issued	20 years, 9 months ago (Nov. 15, 2004)
Published	20 years, 9 months ago (Nov. 15, 2004)
Published Print	20 years, 9 months ago (Nov. 15, 2004)

Funders 0

None

BibTeX

@article{Kang_2004, title={Memory effect from charge trapping in layered organic structures}, volume={85}, ISSN={1077-3118}, url={http://dx.doi.org/10.1063/1.1819991}, DOI={10.1063/1.1819991}, number={20}, journal={Applied Physics Letters}, publisher={AIP Publishing}, author={Kang, Sung Hoon and Crisp, Todd and Kymissis, Ioannis and Bulović, Vladimir}, year={2004}, month=nov, pages={4666–4668} }

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  "abstract": "<jats:p>We demonstrate organic light emitting devices (OLEDs) with a charge trap layer that show memory behavior. These OLEDs demonstrate that organic heterojunction structures can controllably trap and release electronic charges. The trap layer is either 5-nm-thick clustered silver islands, or a 10-nm-thick organic laser dye DCM2 ([2-methyl-6-[2-(2,3,6,7-tetrahydro-1H,5H-benzo[i,j]quinolizin-9-yl)-ethenyl]-4H-pyran-4-ylidene] propane-dinitrile) doped into TPD (N,N\u2032-diphenyl-N,N\u2032-bis(3-methylphenyl)-1,1\u2032-biphenyl-4,4\u2032-diamine). Predictions of the energy band structure indicate that both DCM2 sites and the metal islands can trap charge, consistent with the measured current\u2013voltage characteristics. Trap sites are charged by applying reverse bias over the OLEDs. For devices with DCM2 traps we observe quenching of DCM2 photoluminescence upon charging, which allows us to quantify the charged trap density as approximately 10% of the trap sites or 1018cm\u22123. From time resolved measurements we observe that the charge retention time exceeds 2h.</jats:p>",
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