Design and Realization of White Quantum Dot Light-Emitting Electrochemical Cell Hybrid Devices.
Julia FrohleiksSandra GellnerSvenja WepferGerd BacherEkaterina NannenPublished in: ACS applied materials & interfaces (2018)
The simple device architecture as well as the solution-based processing makes light-emitting electrochemical cells (LECs) a promising device concept for large-area flexible lighting solutions. The lack of deep-blue emitters, which are, at the same time, efficient, bright, and long-term stable, complementary to the wide variety of yellow-orange-emitting LECs, hampers the creation of white LECs. We present a hybrid device concept for the realization of white light emission by combining blue colloidal quantum dots (QDs) and an Ir-based ionic transition-metal complex (iTMC) LEC in a new type of white QD-LEC hybrid device (QLEC). By careful arrangement of the active layers, we yield light emission from both the blue QDs and the yellow iTMC emitter already at voltages below 3 V. The QLEC devices show homogeneous white light emission with high color rendering index (up to 80), luminance levels above 850 cd m-2, and a maximum external quantum efficiency greater than 0.2%.
Keyphrases
- light emitting
- quantum dots
- solid state
- ionic liquid
- gold nanoparticles
- transition metal
- induced apoptosis
- stem cells
- oxidative stress
- cell cycle arrest
- molecularly imprinted
- molecular dynamics
- cell proliferation
- cell therapy
- sensitive detection
- label free
- endoplasmic reticulum stress
- cell death
- bone marrow
- simultaneous determination
- solar cells
- electron transfer