Light Emitting Device

摘要

A composition comprising: a host material; a quantum dot material; and a first phosphorescent material, wherein the lowest triplet energy state of said host material is at a higher energy than a lowest triplet excited state of said phosphorescent material wherein the emission energy level of said quantum dot is at a higher energy that the lowest triplet excited state of said phosphorescent material. Also disclosed is a light emitting device comprising the above composition. The composition may comprise one or more further quantum dot materials and/or one or more further phosphorescent materials. The composition may comprise a second phosphorescent material which has a lower emissive energy state than that of the first phosphorescent material, wherein the first material may be a green light emitting material and the second material may be a red light emitting material.