Specifics and Challenges to Flexible Organic Light-Emitting Devices

Table 1

Main properties of the commercially available 100 m thick plastic substrates for flexible OLEDs application [8–12].

Properties	PET	PEN	PI	PC
Flexibility (tensile strength, MPa)	230	200	150	75
Elasticity (Young modulus, GPa)	2.8–3	3–5	2-3	2.4
Thermal conductivity, W/m·K	0.20	0.15	0.25	0.22
Coefficient of thermal expansion, m/°C	33	20	30	66
Transition temperature, °C	90–100	120	270	145
Transparency in the visible region, %	>90	88	65–70	90
Water absorption, %	0.6	0.4	2.9	0.3
Solvent resistance	Good	Good	Good	Poor