Excitation energy transfer and spatial exciton confinement in polyfluorene blends for application in light-emitting diodes

2002 ◽  
Vol 12 (12) ◽  
pp. 3523-3527 ◽  
Author(s):  
Ana Charas ◽  
Jorge Morgado ◽  
J. M. G. Martinho ◽  
A. Fedorov ◽  
Luis Alcácer ◽  
...  
Keyword(s):  
Energy Transfer ◽  
Excitation Energy ◽  
Light Emitting Diodes ◽  
Excitation Energy Transfer ◽  
Light Emitting

Excitation energy transfer in segmented ladder-type poly (para-phenylene) blue light emitting diodes

1995 ◽  
Vol 96 (3) ◽  
pp. 167-170 ◽  
Author(s):  
C. Paar ◽  
J. Stampfl ◽  
S. Tasch ◽  
H. Kreimaier ◽  
G. Leising ◽  
...  
Keyword(s):  
Energy Transfer ◽  
Excitation Energy ◽  
Blue Light ◽  
Light Emitting Diodes ◽  
Excitation Energy Transfer ◽  
Light Emitting

Efficient red- and orange-light-emitting diodes realized by excitation energy transfer from blue-light-emitting conjugated polymers

1997 ◽  
Vol 56 (8) ◽  
pp. 4479-4483 ◽  
Author(s):  
S. Tasch ◽  
E. J. W. List ◽  
C. Hochfilzer ◽  
G. Leising ◽  
P. Schlichting ◽  
...  
Keyword(s):  
Energy Transfer ◽  
Excitation Energy ◽  
Conjugated Polymers ◽  
Blue Light ◽  
Light Emitting Diodes ◽  
Excitation Energy Transfer ◽  
Light Emitting

Efficient color tuning (blue, red-orange, white) of light emitting diodes by excitation energy transfer

1998 ◽  
Vol 9 (1-4) ◽  
pp. 183-187 ◽  
Author(s):  
E.J.W. List ◽  
S. Tasch ◽  
C. Hochfilzer ◽  
G. Leising ◽  
P. Schlichting ◽  
...  
Keyword(s):  
Energy Transfer ◽  
Excitation Energy ◽  
Light Emitting Diodes ◽  
Excitation Energy Transfer ◽  
Color Tuning ◽  
Light Emitting

Dynamics of Polarons in Guest-Host-System Polymer Light Emitting Devices

1997 ◽  
Vol 488 ◽  
Author(s):  
E.J.W. List ◽  
J. Partee ◽  
W. Graupner ◽  
J. Shinar ◽  
G. Leising
Keyword(s):  
Energy Transfer ◽  
Magnetic Resonance ◽  
Excitation Energy ◽  
Active Layer ◽  
Excitation Energy Transfer ◽  
Light Emitting ◽  
Host System ◽  
Light Emitting Devices ◽  
Polymer Light Emitting Devices

AbstractThe conjugated ladder-type poly(paraphenylene) is an attractive material for blue polymer light emitting devices (PLED). Blending the active layer with small amounts of a red emitting guest polymer, the emission shifts from blue to red with increasing guest concentration due to efficient excitation energy transfer. The results of photoluminescence detected magnetic resonance, electroluminescence detected magnetic resonance measurements and current detected magnetic resonance measurements on PLEDs based on 0.05w%/o - 2w%/o red emitting poly(perylene-co-diethynylbenzene) (PPDB) in the active layer of the PLED are presented and discussed.

The Application of Poly(Phenylene) Type Polymers and Oligomers in Electroluminescent Color Displays

1997 ◽  
Vol 471 ◽  
Author(s):  
S. Tasch ◽  
C. Brandstätter ◽  
W. Graupner ◽  
S. Hampel ◽  
C. Hochfilzer ◽  
...  
Keyword(s):  
Energy Transfer ◽  
Excitation Energy ◽  
White Light ◽  
Light Emission ◽  
Excitation Energy Transfer ◽  
Blue Emission ◽  
Environmental Stability ◽  
Large Area ◽  
Light Emitting ◽  
Color Conversion

ABSTRACTDue to their high photoluminescence efficiency (>30%), high environmental stability and the good charge transport properties the derivatives of poly(paraphenylene) (PPP), as the laddertype PPP (LPPP) and the oligomer hexaphenyl, are very suitable materials to realise efficient, stable, large area blue organic light-emitting diodes (OLEDs). The emission of blue OLEDs can be efficiently converted into all other emission colors either by an external color conversion technique (ECCT) or an internal color conversion technique (ICCT) and hence are very interesting for a number of display applications:Firstly, we demonstrate the realisation of efficient red-green-blue (RGB) emission colors (representing the RGB-pixels in a multicolor display) by an external CCT. In this case the blue EL device is covered with highly fluorescenct dye/matrix layers, which are excited by the blue emission and emit photoluminescence light in a lower energetic range.Secondly, a new method for producing efficient white light-emitting polymer diodes (which are interesting for e.g. backlight sources in liquid crystal displays) based on a blend of two polymers is presented: a blue light-emitting m-LPPP and a red-orange emitter poly(perylene-co-diethynylbenzene) (PPDB). The red-orange emission is created within the EL device (ICCT) by an excitation energy transfer from m-LPPP into the energetically lower lying states of PPDB. This internal excitation energy transfer is very efficient, so that only a concentration of 0.05 weight % PPDB in the polymer blend is required in order to obtain white light emission.

Ultrafast Excitation Energy Transfer in a Blend of Light-Emitting Conjugated Polymers

1999 ◽  
Vol 101 (1-3) ◽  
pp. 306-307 ◽  
Author(s):  
G. Cerullo ◽  
W. Graupner ◽  
G. Lanzani ◽  
M. Nisoli ◽  
E.J.W. List ◽  
...  
Keyword(s):  
Energy Transfer ◽  
Excitation Energy ◽  
Conjugated Polymers ◽  
Excitation Energy Transfer ◽  
Light Emitting

scholarly journals High-performance quasi-2D perovskite light-emitting diodes: from materials to devices

2021 ◽  
Vol 10 (1) ◽  
Author(s):  
Li Zhang ◽  
Changjiu Sun ◽  
Tingwei He ◽  
Yuanzhi Jiang ◽  
Junli Wei ◽  
...  
Keyword(s):  
Energy Transfer ◽  
High Performance ◽  
Light Emitting Diodes ◽  
Structural Characteristics ◽  
Quantum Yields ◽  
Research Directions ◽  
Light Emitting ◽  
Perovskite Materials ◽  
Quantum Confinement Effects ◽  
Semiconducting Properties

AbstractQuasi-two-dimensional (quasi-2D) perovskites have attracted extraordinary attention due to their superior semiconducting properties and have emerged as one of the most promising materials for next-generation light-emitting diodes (LEDs). The outstanding optical properties originate from their structural characteristics. In particular, the inherent quantum-well structure endows them with a large exciton binding energy due to the strong dielectric- and quantum-confinement effects; the corresponding energy transfer among different n-value species thus results in high photoluminescence quantum yields (PLQYs), particularly at low excitation intensities. The review herein presents an overview of the inherent properties of quasi-2D perovskite materials, the corresponding energy transfer and spectral tunability methodologies for thin films, as well as their application in high-performance LEDs. We then summarize the challenges and potential research directions towards developing high-performance and stable quasi-2D PeLEDs. The review thus provides a systematic and timely summary for the community to deepen the understanding of quasi-2D perovskite materials and resulting LED devices.

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