申请人:Sumitomo Chemical Company, Ltd.
公开号:EP3306694A1
公开(公告)日:2018-04-11
To provide a light emitting device capable of emitting light at high luminance.
A light emitting device comprising
an anode,
a cathode,
a phosphorescent light emitting layer,
an electron transporting layer (B) disposed between the cathode and the light emitting layer and adjacent to the cathode, and
an electron transporting layer (A) disposed between the light emitting layer and the electron transporting layer (B) ,
wherein
P (eV) which is the smallest work function of the metal material contained in an amount of 1% by weight or more in the cathode,
Q (eV) which is the smallest electron affinity of the compound contained in an amount of 5% by weight or more in the light emitting layer,
RA (eV) which is the smallest electron affinity of the compound contained in an amount of 5% by weight or more in the electron transporting layer (A) and
RB (eV) which is the smallest electron affinity of the compound contained in an amount of 5% by weight or more in the electron transporting layer (B) satisfy the formulae (1A) to (4A) : P>3.5 Q<2.7 P>RB>Q RB>RA
提供一种能以高亮度发光的发光器件。
发光器件包括
阳极
阴极
磷光发光层、
设置在阴极和发光层之间并邻近阴极的电子传输层 (B),以及
位于发光层和电子传输层(B)之间的电子传输层(A)、
其中
P (eV),即阴极中金属材料的最小功函数,其含量为阴极重量的 1%或以上、
Q (eV),即发光层中所含化合物的最小电子亲和力,含量为 5%(按重量计)或更多、
RA(电子伏特)是电子传输层(A)中所含化合物的最小电子亲和力,其含量为 5%(按重量计)或更多;以及
RB(eV)是电子传输层(B)中所含化合物的最小电子亲和力,按重量计,含量为 5%或更多,满足式(1A)至(4A):P>3.5 QRB>Q RB>RA