A problem to be solved of the invention is to provide a package of a liquid composition for an organic electroluminescent device including a phosphorescent material and a solvent with extended storage lifetime, which may be produced with high working efficiency. A solving means of the problem is a package of a liquid composition for an organic electroluminescent device having a liquid composition for an organic electroluminescent device including a phosphorescent material and a solvent, and a container that contains the liquid composition for an organic electroluminescent device, wherein the package of a liquid composition for an organic electroluminescent device has a transmittance of light, that is a wavelength component of from 500 nm to 780 nm, from outside of the package to inside of the container of 15% or less.

A polymer containing an optionally substituted repeat unit of formula (I) wherein each R is the same or different and represents H or an electron withdrawing group, and each R.sup.1 is the same or different and represents a substituent. ##STR00001##

A conjugated polymer comprises repeating units as represented by formula (I),
A-B.sub.p  (I) p is the number of the repeating units, and p is an integer more than or equal to 1; and A has a structure as represented by formula (II), and B has a structure as represented by formula (II) or formula (III). ##STR00001## The described conjugated polymer has a higher triplet energy level and a higher charge transfer property.

Nanoparticle compositions comprising nanoparticles formed from -conjugated cross-linked polymers are disclosed, together with their methods of manufacture and their applications. Owing to the nature of the cross-links formed therein, the nanoparticle compositions afford a high degree of manufacturing flexibility and control, as well as being amenable to facile purification for the purpose of imaging and electronics applications.

A light emitting device contains an anode, cathode, and two organic layers provided therebetween. One organic layer contains a phosphorescent compound, the second organic layer contains a block copolymer containing an end group, a block that binds to the end group and/or a block that does not bind to the end group, and a crosslinked product of the block copolymer. The non-terminal block contains a non-crosslinkable unit represented by the formula (X) and/or a non-crosslinkable unit represented by the formula (Z). At least one of X.sub.I>X.sub.II; Z.sub.I>Z.sub.II; X.sub.I+Z.sub.I>X.sub.II+Z.sub.II is satisfied when the total number of units having formula (X) and the total number of units having formula (Z) in the non-terminal block are X.sub.I and Z.sub.I, respectively, and the total number of units having formula (X) and the total number of units having formula (Z) in the terminal block are X.sub.II and Z.sub.II, respectively.

A block copolymer includes an end group, a block that binds to the end group, and a block that does not bind to the end group. The block that does not bind to the end group contains at least one non-crosslinkable constitutional unit represented by the formula (X) and/or at least one non-crosslinkable constitutional unit represented by the formula (Z). At least one of formulas (i) X.sub.I>X.sub.II, (ii) Z.sub.I>Z.sub.II and (iii) X.sub.I+Z.sub.I>X.sub.II+Z.sub.II is satisfied when the total number of non-crosslinkable constitutional units represented by formulas (X) and (Z) in the block that does not bind to the end group are represented by X.sub.I and Z.sub.I, respectively, and the total number of non-crosslinkable constitutional units represented by formulas (X) and (Z) in the block that binds to the end group are represented by X.sub.II and Z.sub.II, respectively.

Nanoparticle compositions comprising nanoparticles formed from -conjugated cross-linked polymers are disclosed, together with their methods of manufacture and their applications. Owing to the nature of the cross-links formed therein, the nanoparticle compositions afford a high degree of manufacturing flexibility and control, as well as being amenable to facile purification for the purpose of imaging and electronics applications.

A conjugated polymer comprises repeating units as represented by formula (I),

AB.sub.p (I)

p is the number of the repeating units, and p is an integer more than or equal to 1; and A has a structure as represented by formula (II), and B has a structure as represented by formula (II) or formula (III).

##STR00001##

The described conjugated polymer has a higher triplet energy level and a higher charge transfer property.

A block copolymer includes an end group, a block that binds to the end group, and a block that does not bind to the end group. The block that does not bind to the end group contains at least one non-crosslinkable constitutional unit represented by the formula (X) and/or at least one non-crosslinkable constitutional unit represented by the formula (Z). At least one of formulas (i) X.sub.I>X.sub.II, (ii) Z.sub.I>Z.sub.II and (iii) X.sub.I+Z.sub.I>X.sub.II+Z.sub.II is satisfied when the total number of non-crosslinkable constitutional units represented by formulas (X) and (Z) in the block that does not bind to the end group are represented by X.sub.I and Z.sub.I, respectively, and the total number of non-crosslinkable constitutional units represented by formulas (X) and (Z) in the block that binds to the end group are represented by X.sub.II and Z.sub.II, respectively.

Polymer and Organic Light Emitting Device A polymer comprising a repeat unit of formula (I a), (I b) or (Ic): (Formulae (Ia), (Ib), (Ic)) wherein M is a metal; R is a backbone repeat group; n is 1 or 2; Sp is a spacer group; w is 0 or 1; L.sup.1 and L.sup.2 are mono- or bidentate co-coordinating groups; ---- represents a second metal to ligand bond in the case where L.sup.1 or L.sup.2 is a bidentate ligand and at least one of L.sup.1 and L.sup.2 is substituted with group of formula (II) (Formula (II)) wherein m is 0 or 1; each Ar.sup.1, Ar.sup.2 and Ar.sup.3 is aryl or heteroaryl. The polymer may be used as an emissive material in an organic light-emitting device. ##STR00001##