Lucas & Mercanti, LLP
Organic electroluminescent element
An organic electroluminescent element includes a hole injection layer (HI), a first hole transport layer (HT1), a second hole transport layer (HT2), and a light-emitting layer containing a host compound (H) and a phosphorescence emitting dopant compound (D), which are laminated in this order, between and an anode and a cathode. The phosphorescence emitting dopant compound has a partial structure represented by Formula (1):The “highest occupied molecular orbital” HOMO of the second hole transport layer satisfies the expression: −5.4<HOMO (HT2)<−4.8; and the relationship of triplet excitation energies (T1) between the phosphorescence emitting dopant compound and a hole transport material contained in the second hole transport layer satisfies the expression: T1 (HT2)−T1 (D)>0.1.
KONICA MINOLTA, INC.
H C C C H C C H C C H C H H H H H H C H H C
H01L C09K C09K C09K H01L C09K C09K H01L C09K C09K H01L C09K H01L H01L H01L H01L H01L H05B C09K H01L H01L C09K
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Hiroto Kunimasa Eisaku Kunio
Ito Hiyama Katoh Tani