Methods of determining a composition ratio of an organic white-light-emitting blend material

A method of determining a composition ratio of an organic white light-emitting blend material which comprises three electroluminescent organic light-emitting material components which are each independently light-emitting conjugated polymers, light-emitting non-conjugated polymers, organic low-molecular weight light-emitting materials, copolymers of the above materials, or a derivative of the above materials, comprising the steps of:

• (a) defining the electroluminescent organic light-emitting material component having the highest bandgap energy as a host component and defining the other electroluminescent organic light-emitting material components as at least a first dopant and a second dopant;
• (b) generating a plurality of binary blends comprising the host component and the first dopant wherein each of the binary blends has a different concentration of the first dopant and where the first dopant is present in an amount of 0.1 wt % or less in each of the binary blends;
• (c) determining a binary composition ratio between the host material and the first dopant wherein a luminescent intensity of the host component is comparable to that of the first dopant;
• (d) generating a plurality of binary blends comprising the host component and the second dopant, wherein each of the binary blends has a different concentration of the second dopant and where the second dopant is present in an amount of 0.1 wt % or less in each of the binary blends;
• (e) determining a binary composition ratio between the host material and the second dopant wherein a luminescent intensity of the host component is essentially the same as the second dopant;
• and
• (f) combining said binary composition ratios to obtain a composition ratio, wherein the first dopant and second dopant are each present in an amount of 0.1 wt % or less based on the total weight of the organic white light-emitting blend material.