1. Summary from early, published work on devices using
FRET or electron transfer

2. by manipulation of organized molecular systems
Time-limited spectral sensitization using FRET and electron transfer
by manipulation of organized molecular systems
LB-layer
d=0 nm electron transfer
J-agg fluorescence
at various distances d
from AgBr surface FRET
d=2.7 nm
d=5.4 nm
Möbius, Steiger 1975
CIBA GEIGY Patent 1976
« Manipulated» means: LB-layer transferred to a PVA foil
which is then contacted with AgBr-crystal
during limited time intervals

3. Fluorescent Paraquat Pesticide sensor CSEM Patent
based on supramolecular organisation into J-aggregates and electron transfer
Jagg fluorescence
without Paraquat
with some ppm
Paraquat

4. Red emitting OLED for down-conversion by FRET
using supramolecular organisation into J-aggregates ILFORD/EPFL
No J-aggregate present
J-aggregate + Alq3
Green fluorescence of Alq3
Energy transfer from UV excited green-emitting Alq3
to a red-emitting J-aggregate

5. Nanoporous Semiconductor NO2 sensor
at room temperature based on electron transfer
conductive, nanocristalline porous ITO coatings
on flexible polymer substrates

6. n = 1.1-1.2 Nanocrystalline, mesoporous ITO coatings
Nanoparticles ( nm diameter, spheroids, SEM )
Resistance:
600 Ohms/
Transmission (VIS):
80%
Thickness:
5600 nm (10 g ITO/m2) 5% PVA vs. ITO
n =
A double layer shows 4x less resistivity, and 8%PVA vs. 5% 400 Ohm/
in a single layer and less cracking
IR-reflectivity at 10 m:  45% ident. ITO BALZERS (vs. Al=100%)
Pore Vol. BET: ml/g
Pore Diam. BET: nm (spec.surf. 43 m2/g)
Tested applications:
- OLED with increased optical efficiency, see next slide
- Gas sensor (NO2 ) - Ink-jet patterning – J-aggregates organized on this ITO
smallest n, touch-screen conductivity like PEDOT, high IR refl., mech. and scotch-tape resistant.
Ohm’s law fulfilled for electronic conduction.

7. 2x enhanced Light extraction for Displays using low refractive index
of nanoporous ITO and AlOOH coatings
Waveguiding in glass