Luminescent element material and luminescent element comprising the same

Abstract

The light emitting device of the present invention relates to a light emitting device which is characterized in that it is a device with an emissive substance present between an anode and cathode, and which emits light by means of electrical energy, and said device has a spiro compound represented by general formula (1) A1 and A2 are each selected from single bonds, substituted or unsubstituted alkyl chains, ether chains, thioether chains, ketone chains and substituted or unsubstituted amino chains. However, A1<> A2. Z represents carbon or silicon. R1 to R16 are each selected from hydrogen, alkyl group, cycloalkyl group, aralkyl group, alkenyl group, cycloalkenyl group, alkynyl group, hydroxyl group, mercapto group, alkoxy group, alkylthio group, aryl ether group, aryl thioether group, aryl group, heterocyclic group, halogen, haloalkane, haloalkene, haloalkyne, cyano group, aldehyde group, carbonyl group, carboxyl group, ester group, carbamoyl group, amino group, nitro group, silyl group, siloxanyl group and a cyclic structure formed with an adjacent substituent.

Description

technical field [0001] The present invention relates to an element for converting electrical energy into light, and relates to a light-emitting element and a light-emitting element which can be used in display elements, flat panel displays, backlights, lighting fixtures, interior decorations, signs, notice boards, electronic cameras, optical signal generators, etc. Material. Background technique [0002] In recent years, research has been active on organic laminated thin-film light-emitting devices that emit light when electrons injected from the cathode and holes injected from the anode recombine in an organic phosphor sandwiched between the two electrodes. The feature of this device is that it is thin, emits light with high brightness at low driving voltage, and can generate multi-colored emission by selecting fluorescent materials, so it has attracted attention. [0003] Since C.W.Tang et al. of Kodak Company revealed that organic laminated thin film components emit ligh...

AI Technical Summary

Problems solved by technology

[0005] However, conventional luminescent materials, hole transport materials, and electron transport materials are often poor in durability, and crystallization occurs due to heating of the element due to long-term energization, and the life of the element is shortened.

[0006] Especially in the presence of electron transport materials, even if a few existing materials are used, the desired luminous color cannot be obtained due to the interaction with the luminescent material or the luminescence of the electron transport material itself, even if high efficiency can be obtained. Luminescence, poor durability, etc.

In U.S. Patent No. 5,393,614, the specific phenanthroline derivative used in the electron transport material exhibits high-efficiency light emission, but crystallization occurs due to long-term energization, and there is a problem that the film becomes cloudy

In addition, there are quinoline metal complexes and benzoquinoline metal complexes as substances exhibiting relatively good physical properties in luminous efficiency and durability, but since these materials themselves have high blue-green to yellow luminescence capabilities, When used as an electron transport material, the luminescence of these materials themselves is mixed, and the color purity deteriorates

Images