Compounds that are organic radicals that can have a dual function. The compounds can be fluorescent emitters that emit in the near-IR. The compounds can also facilitate reverse intersystem crossing (RISC) to convert triplet excitons in an OLED to singlet excited states to maximize utilization of generated excitons in the OLED and approach 100% internal quantum efficiency.

A database system uses byte ordering for keys and a trie index to reference stored data. The keys of a database are converted into byte-comparable sequences of byte values. The trie index is generated including nodes connected by edges defining paths from a root node to leaf nodes. Each edge is associated with at least one byte value such that each path from the root node to a leaf node through one or more edges defines a unique byte prefix for a byte-comparable sequence of byte values. The leaf node of each path is associated with a database location value. A record is accessed in the database using a database location value determined from referencing the trie index using a byte-comparable sequence of byte values of the record generated from a key of the record. A trie structure and byte ordered keys may be used for partition or row indices.

The compound represented by formula (1):

##STR00001##

wherein symbols are as defined in the description, provides an organic electroluminescence device having a device performance further improved.

The compound represented by formula (1):

##STR00001##

wherein symbols are as defined in the description, provides an organic electroluminescence device having a device performance further improved.

The present invention relates to a selective method for carrying out the Buchwald-Hartwig coupling of biphenyl derivatives.

Compounds of formula (1):

##STR00001##

wherein each symbol is as defined in the description, may provide an organic electroluminescence device having a further improved performance.

Compounds of formula (1):

##STR00001##

wherein each symbol is as defined in the description, may provide an organic electroluminescence device having a further improved performance.

Provided is a blue light emitting organic EL device having high emission efficiency and a long lifetime.

An organic electroluminescent device comprising one or more light emitting layers between an anode and a cathode opposite to each other, wherein at least one of the light emitting layers contains an organic emission material having a difference between excited singlet energy (S1) and excited triplet energy (T1) (ΔEST) of 0.20 eV or less as a light emitting dopant, a first host selected from the compounds represented by the following general formula (1), and a second host selected from the compounds represented by the following general formula (2).

##STR00001##

Provided are a triarylamine derivative and an organic electroluminescent device thereof, which relate to the technical field of organic electroluminescence. The triarylamine derivative has a relatively high triplet energy level, high hole mobility, a high refractive index and good film formability and thermal stability and can effectively reduce the driving voltage of the organic electroluminescent device, improve the luminescence efficiency, and extend the service life of the device when applied to the organic electroluminescent device. The triarylamine derivative has a good application effect and a good industrialization prospect in the organic electroluminescent device.

The present invention relates to a compound represented by formula 1, an organic optoelectronic element comprising the same, and a display device comprising the organic optoeletric element. Formula 1 and the description regarding the samen are as defined in the specification.