Display material
Provided herein is a phase change material for use in a display device. Also provided is a display device comprising a phase change material; the use of a phase change material as an optical absorber in a display device; a method of fabricating a pixel; and a method of fabricating a display device. The phase change material is as described in more detail herein.
1. A display device comprising:
a plurality of electrodes:
at least one layer of a phase change material having (i) a recrystallization temperature of at most about 250° C. and a recrystallization time of at least about 1 μs;
and/or (ii) a melting point of at most about 500° C.; said phase change material having a refractive index which is reversibly controllable by application of a voltage to said electrodes;
a controller adapted to apply said voltage, via said electrodes, to control the refractive index of said phase change material;
wherein said at least one layer of said phase change material is disposed between a reflector and a viewing surface, and
wherein said phase change material is selected from:
Sb 31.91 G 40.07 Te 28.03 ;
Sb 35.8 Ge 34.91 Te 29.28 ,
Sb 11.72 G 56.57 Te 31.71 ;
Sb 22.26 Ge 47.06 Te 30.68 ;
Sb 46.96 Ge 24.95 Te 28.09 ;
Sb 22.8 Ge 47.82 Te 29.38 ;
Sb 44.34 Ge 27.5 Te 28.16 ;
Sb 45.54 Ge 24.96 Te 29.46 ;
Sb 41.45 Ge 27.93 Te 30.62 ;
Sb 50.51 Ge 20.3 Te 29.19 ;
Sb 51.96 Ge 22.01 Te 26.03 ;
Sb 33.78 Ge 44.23 Te 21.98 ;
Sb 54.49 Ge 23.97 Te 21.54 ;
Sb 49.8 Ge 27.68 Te 22.52 ;
Sb 48.8 Ge 29.98 Te 21.52 ;
Sb 66.3 Ge 16.2 Te 17.5 ;
Sb 49.67 Ge 20.43 Te 29.9 ;
Sb 45.57 Ge 24.96 Te 29.46 ;
Sb 38.68 Ge 28.41 Te 32.92 ;
Sb 38.37 Ge 30.62 Te 31.02 ;
Sb 36.15 Ge 30.89 Te 32.96 ;
Sb 34.27 Ge 34.99 Te 30.74 ;
Sb 33.79 Ge 41.06 Te 25.15 ;
Sb 24.63 Ge 42.71 Te 32.66 ;
Se 51 Te 21 Sn 28 ;
Ge 8 Sn 5 Te 87 ; and
Te 80 Sn 15 Ge 5 .
2. The display device of claim 1 , further comprising at least one spacer layer between said reflector and at least one layer of said phase change material; and/or a capping layer, wherein a surface of said capping layer optionally constitutes said viewing surface.
3. The display device of claim 1 wherein a barrier layer between at least one layer of said phase change material and at least one spacer layer and/or at least one capping layer is used to modify the properties of the phase change material comprised within the device.
4. A display comprising a plurality of independently controllable display devices according to claim 1 .