An objective of the invention is to provide, as a material for highly efficient, highly durable organic EL devices, an organic compound having excellent properties, such as excellent electron injection capability and transportability, hole blocking capability, and high stability in a thin-film state, and also to provide a highly efficient, highly durable organic EL device by using this compound. The present invention has been achieved by focusing on the fact that a benzotriazole ring structure, which has electron affinity, contains nitrogen atoms having the ability to coordinate with a metal and also has excellent heat resistance, and by thus designing and chemically synthesizing various compounds having a benzotriazole ring structure and assessing the properties of various organic EL devices using those compounds, thereby finding out that organic EL devices having excellent properties can be achieved by using specifically-structured compounds having a benzotriazole ring structure.

An objective of the invention is to provide, as a material for highly efficient, highly durable organic EL devices, an organic compound having excellent properties, such as excellent electron injection capability and transportability, hole blocking capability, and high stability in a thin-film state, and also to provide a highly efficient, highly durable organic EL device by using this compound. The present invention has been achieved by focusing on the fact that a benzotriazole ring structure, which has electron affinity, contains nitrogen atoms having the ability to coordinate with a metal and also has excellent heat resistance, and by thus designing and chemically synthesizing various compounds having a benzotriazole ring structure and assessing the properties of various organic EL devices using those compounds, thereby finding out that organic EL devices having excellent properties can be achieved by using specifically-structured compounds having a benzotriazole ring structure.

Provided are a heterocyclic compound and an electronic apparatus. The electronic apparatus includes: a substrate; an organic light-emitting device on the substrate; and a thin film encapsulation portion sealing the organic light-emitting device, the thin film encapsulation portion including an ultraviolet (UV) stabilizing mixture, and the UV stabilizing mixture including a UV absorbent and a radical scavenger.

Provided are a heterocyclic compound and an electronic apparatus. The electronic apparatus includes: a substrate; an organic light-emitting device on the substrate; and a thin film encapsulation portion sealing the organic light-emitting device, the thin film encapsulation portion including an ultraviolet (UV) stabilizing mixture, and the UV stabilizing mixture including a UV absorbent and a radical scavenger.

Provided is an ultraviolet absorber capable of efficiently absorbing harmful lights in a wavelength region of 380 to 400 nm; and suppressing the absorption of lights having a wavelength of not shorter than 400 nm, which constitutes the cause of yellowing at early stages. The ultraviolet absorber can thus be used to produce a member superior in appearance as being less affected by harmful lights, and has an excellent light resistance, heat resistance and durability accordingly. The highly light-resistant ultraviolet absorber of the present invention is comprised of a 2-phenylbenzotriazole derivative that contains a thioaryl ring group or the like and is represented by, for example, the following formula (1):

PhBzT.sup.1a-S—X.sup.1a—(R.sup.1a).sub.l  (1) wherein PhBzT.sup.1a represents a substituted or unsubstituted 2-phenylbenzotriazole skeleton bonded to a thioaryl ring group (—S—X.sup.1a— . . . ), X.sup.1a represents a residue of a phenyl ring or the like, each of l R.sup.1as independently represents, for example, a hydrocarbon group having 1 to 18 carbon atoms, l represents an integer of 0 to 5.

Provided is an ultraviolet absorber capable of efficiently absorbing harmful lights in a wavelength region of 380 to 400 nm; and suppressing the absorption of lights having a wavelength of not shorter than 400 nm, which constitutes the cause of yellowing at early stages. The ultraviolet absorber can thus be used to produce a member superior in appearance as being less affected by harmful lights, and has an excellent light resistance, heat resistance and durability accordingly. The highly light-resistant ultraviolet absorber of the present invention is comprised of a 2-phenylbenzotriazole derivative that contains a thioaryl ring group or the like and is represented by, for example, the following formula (1):

PhBzT.sup.1a-S—X.sup.1a—(R.sup.1a).sub.l  (1) wherein PhBzT.sup.1a represents a substituted or unsubstituted 2-phenylbenzotriazole skeleton bonded to a thioaryl ring group (—S—X.sup.1a— . . . ), X.sup.1a represents a residue of a phenyl ring or the like, each of l R.sup.1as independently represents, for example, a hydrocarbon group having 1 to 18 carbon atoms, l represents an integer of 0 to 5.

Disclosed is a blue light absorbing compound, its preparation method and use. The compound has high stability and is suitable for high temperature processing conditions as well as outdoor application. A method of covalently bonding a blue light absorbing compound with an ultraviolet light absorbing compound for increasing its stability is also provided. The compound is capable of absorbing or blocking ultraviolet light (UVA, UVB) and blue light to protect eyes. But long-wavelength blue light can be absorbed diminishingly, so that the transmitted light has a particularly good visual experience.

##STR00001##

Disclosed is a blue light absorbing compound, its preparation method and use. The compound has high stability and is suitable for high temperature processing conditions as well as outdoor application. A method of covalently bonding a blue light absorbing compound with an ultraviolet light absorbing compound for increasing its stability is also provided. The compound is capable of absorbing or blocking ultraviolet light (UVA, UVB) and blue light to protect eyes. But long-wavelength blue light can be absorbed diminishingly, so that the transmitted light has a particularly good visual experience.

##STR00001##

The present invention is an organic EL element in which a material used for a capping layer is a material having a high absorbance as measured at a wavelength of 400 to 410 nm in an absorption spectrum at a concentration of 10.sup.−5 mol/L, and the material is selected from an arylamine material which provides excellent stability and durability to a thin film, particularly selected from a diamine compound that has a particular benzazol ring structure having a high refractive index.

##STR00001##

The present invention is an organic EL element in which a material used for a capping layer is a material having a high absorbance as measured at a wavelength of 400 to 410 nm in an absorption spectrum at a concentration of 10.sup.−5 mol/L, and the material is selected from an arylamine material which provides excellent stability and durability to a thin film, particularly selected from a diamine compound that has a particular benzazol ring structure having a high refractive index.

##STR00001##