H - Electricity – 05 – B
Patent
H - Electricity
05
B
H05B 33/14 (2006.01) H01L 51/30 (2006.01) H01L 51/50 (2006.01) G09F 13/22 (2006.01)
Patent
CA 2289181
The objective of the present invention lies in offering red electroluminescent elements which have a high electrical energy utilization efficiency and outstanding colour purity. The objective of the present invention is realized by means of electroluminescent elements wherein a substance which brings about luminescence is present between an anode and cathode, and the electroluminescent elements emit light of peak wavelength at least 580 nm by means of electrical energy, and the substance which brings about luminescence contains at least a fluorescent compound of fluorescence maximum 540 nm or above and a compound with a pyrromethene structure represented by the following general formula (1) or metal complex thereof: (see formula I) (here, R1 to R7 may be the same or different, and are selected from hydrogen, alkyl group, alkoxy group, halogen group, aryl group, aralkyl group, alkenyl group, arylether group, heterocycle group,~cyano group, aldehyde group, carbonyl group, ester group, carbamoyl group, amino group, and fused rings and aliphatic rings formed with an adjacent substituent and X is carbon or nitrogen, but in the case where it is nitrogen, no R7 is present.)
Himeshima Yoshio
Kitazawa Daisuke
Kohama Akira
Tominaga Tsuyoshi
Smart & Biggar
Toray Industries Inc.
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