▎ 摘　　要

NOVELTY - A composition comprises poly(3,4-ethylenedioxythiophene), poly(styrene sulfonate) and sulfur ylide. USE - Composition used for light emitting device (claimed) used for display device. Uses include but are not limited to intelligent mobile phone, tablet computer, notebook computer, digital camera, digital video camera intelligent wearable device, intelligent weighing electronic scale, vehicle display, television, electronic book reader, and smart wristband watch. ADVANTAGE - The composition provides device having improved display effect and service life. DETAILED DESCRIPTION - INDEPENDENT CLAIMS are included for the following: preparation of the composition, which involves mixing (S10) poly(3,4-ethylenedioxythiophene), poly(styrene sulfonate), sulfur ylide, and an organic solvent (s1) to obtain a mixture, and heat-treating (S20) the mixture; and a light emitting device, which comprises an anode, a cathode arranged opposite to the anode, a light emitting layer arranged between the anode and cathode, and a hole injection layer arranged between the anode and the light emitting layer, in which a material of the hole injection layer comprises the composition. DESCRIPTION OF DRAWING(S) - The drawing shows a flowchart of the preparation of composition. (Drawing includes non-English language text) S10Mixing process S20Heat-treating process