Appeal No. 2004-1962
Application No. 09/996,415
reduced pressure in forming an organic light-
emitting device (OLED), comprising:
a) a bias heater defined by side walls and a
bottom wall, the side walls having a height
dimension HB;
b) an electrically insulative container
disposed in the bias heater for receiving
vaporizable solid organic material, the container
being defined by side walls and a bottom wall,
and the container side walls having a height
dimension HC which is greater than the height
dimension HB of the bias heater side walls;
c) a vaporization heater disposed on upper
side wall surfaces of the container, the
vaporization heater defining a vapor efflux slit
aperture extending into the container for
permitting vaporized organic material to pass
through the slit aperture and onto the surface of
the structure, wherein the container side walls
are taller than the bias heater side walls to
electrically isolate the vaporization heater from
the bias heater,
d) a bias heater supply for applying an
electrical potential to the bias heater to cause
bias heat to be applied to the solid organic
material in the container, the bias heater
providing a controlled bias temperature which is
insufficient to cause the solid organic material
to vaporize;
e) a vaporization heater power supply for
applying an electrical potential to the
vaporization heater to controllably heat
uppermost portions of the solid organic material
in the container to vaporize the solid organic
material and allow vaporized organic material to
project onto the structure through the efflux
slit aperture to provide an organic layer on the
structure, wherein the vaporization heater power
supply is separate from the bias heater power
supply; and
f) means for providing relative motion
between the vapor deposition source and the
structure to provide a substantially uniform
organic layer on the structure.
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Last modified: November 3, 2007