公开(公告)号：US20180149595A1

公开(公告)日：2018-05-31

申请号：US15823599

申请日：2017-11-28

Applicant: Kyushu University, National University Corporation ,  HAMAMATSU PHOTONICS K.K.

Inventor： Chihaya ADACHI ,  Hajime NAKANOTANI ,  Takahiko YAMANAKA ,  Shigeo HARA ,  Toru HIROHATA

IPC: G01N21/64 ,  H01L51/00 ,  H01L27/15

CPC classification number: G01N21/6486 ,  A61B5/0059 ,  H01L27/15 ,  H01L51/0034 ,  H01L51/0059 ,  H01L51/0067 ,  H01L51/0072 ,  H01L51/5004 ,  H01L51/5012 ,  H01L2251/552

Abstract: An organic EL element having a luminescence peak in a near-infrared range comprises a positive electrode, a negative electrode, and at least one organic layer including a luminescent layer located between the positive electrode and the negative electrode. The luminescent layer comprises a host material, a delayed fluorescent material and a luminescent material. The LUMO and HOMO energy levels of the delayed fluorescent material and the luminescent material, the absorption spectrum of the luminescent material, and the emission spectrum of the delayed fluorescent material satisfy predetermined relationships.