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Title: Spin-polarized light-emitting diodes based on organic bipolar spin valves

Abstract

Spin-polarized organic light-emitting diodes are provided. Such spin-polarized organic light-emitting diodes incorporate ferromagnetic electrodes and show considerable spin-valve magneto-electroluminescence and magneto-conductivity responses, with voltage and temperature dependencies that originate from the bipolar spin-polarized space charge limited current.

Inventors:
; ;
Publication Date:
Research Org.:
University of Utah Research Foundation, Salt Lake City, UT (United States)
Sponsoring Org.:
USDOE
OSTI Identifier:
1404706
Patent Number(s):
9,799,842
Application Number:
14/412,932
Assignee:
University of Utah Research Foundation CHO
DOE Contract Number:
FG02-04ER46109
Resource Type:
Patent
Resource Relation:
Patent File Date: 2013 Jul 03
Country of Publication:
United States
Language:
English
Subject:
36 MATERIALS SCIENCE; 75 CONDENSED MATTER PHYSICS, SUPERCONDUCTIVITY AND SUPERFLUIDITY

Citation Formats

Vardeny, Zeev Valentine, Nguyen, Tho Duc, and Ehrenfreund, Eitan Avraham. Spin-polarized light-emitting diodes based on organic bipolar spin valves. United States: N. p., 2017. Web.
Vardeny, Zeev Valentine, Nguyen, Tho Duc, & Ehrenfreund, Eitan Avraham. Spin-polarized light-emitting diodes based on organic bipolar spin valves. United States.
Vardeny, Zeev Valentine, Nguyen, Tho Duc, and Ehrenfreund, Eitan Avraham. 2017. "Spin-polarized light-emitting diodes based on organic bipolar spin valves". United States. doi:. https://www.osti.gov/servlets/purl/1404706.
@article{osti_1404706,
title = {Spin-polarized light-emitting diodes based on organic bipolar spin valves},
author = {Vardeny, Zeev Valentine and Nguyen, Tho Duc and Ehrenfreund, Eitan Avraham},
abstractNote = {Spin-polarized organic light-emitting diodes are provided. Such spin-polarized organic light-emitting diodes incorporate ferromagnetic electrodes and show considerable spin-valve magneto-electroluminescence and magneto-conductivity responses, with voltage and temperature dependencies that originate from the bipolar spin-polarized space charge limited current.},
doi = {},
journal = {},
number = ,
volume = ,
place = {United States},
year = 2017,
month =
}

Patent:

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  • In this paper, we demonstrate the concept of a room-temperature spin-polarized organic light-emitting diode (Spin-OLED) structure based on (i) the deposition of an ultra-thin p-type organic buffer layer on the surface of the ferromagnetic electrode of the Spin-OLED and (ii) the use of oxygen plasma treatment to modify the surface of that electrode. Experimental results demonstrate that the brightness of the developed Spin-OLED can be increased by 110% and that a magneto-electroluminescence of 12% can be attained for a 150 mT in-plane magnetic field, at room temperature. This is attributed to enhanced hole and room-temperature spin-polarized injection from the ferromagnetic electrode,more » respectively.« less
  • Provided are microlens arrays for use on the substrate of OLEDs to extract more light that is trapped in waveguided modes inside the devices and methods of manufacturing same. Light extraction with microlens arrays is not limited to the light emitting area, but is also efficient in extracting light from the whole microlens patterned area where waveguiding occurs. Large microlens array, compared to the size of the light emitting area, extract more light and result in over 100% enhancement. Such a microlens array is not limited to (O)LEDs of specific emission, configuration, pixel size, or pixel shape. It is suitablemore » for all colors, including white, for microcavity OLEDs, and OLEDs fabricated directly on the (modified) microlens array.« less
  • Comprising hole- and electron-transporting moieties with flexible linkages, representative non-conjugated bipolar hybrids have been synthesized and characterized for a demonstration of their potential use as host materials for the fabrication of phosphorescent organic light-emitting diodes. The advantages of this material class include solution processing into amorphous films with elevated glass transition temperatures, stability against phase separation and crystallization, and provision of LUMO/HOMO levels and triplet energies contributed by the two independent moieties without constraint by the electrochemical energy gap. While exciplex formation between the hole- and electron-transporting moieties is inevitable, its adverse effects on spectral purity and device efficiency canmore » be avoided by trapping charges on triplet emitters, as demonstrated for Ir(mppy)3 in TRZ-3Cz(MP)2, and TRZ-1Cz(MP)2. With these two bipolar hybrids and hole-transporting Cz(MP)2 as the host, the maximum current efficiency of the bilayer PhOLED is achieved with TRZ-3Cz(MP)2, but the driving voltage decreases monotonically with an increasing TRZ content.« less
  • A visible light source device is described based on a light emitting diode and a nanocluster-based film. The light emitting diode utilizes a semiconductor quantum well structure between n-type and p-type semiconductor materials on the top surface a substrate such as sapphire. The nanocluster-based film is deposited on the bottom surface of the substrate and can be derived from a solution of MoS.sub.2, MoSe.sub.2, WS.sub.2, and WSe.sub.2 particles of size greater than approximately 2 nm in diameter and less than approximately 15 nm in diameter, having an absorption wavelength greater than approximately 300 nm and less than approximately 650 nm.