Organic electroluminescent materials and devices

The OLED of claim 1, wherein the first layer further comprises a third compound;

• wherein one of the first compound, second compound, or third compound is selected from a phosphorescent capable material or thermally activated delayed fluorescent capable material;
• wherein one of the first compound, second compound, or third compound is selected from a fluorescent material or thermally activated delayed fluorescent capable material;
• and
• wherein one of the first compound, second compound, or third compound is a host material.

The OLED of claim 2, wherein OLED further comprises a second layer disposed between the first electrode and the second electrode;

• wherein
• the second layer is selected from the group consisting of HIL, HTL, EBL, EML, HBL, ETL, and EIL;
• the second layer is a different type of layer from the first layer;
• the second layer comprises a third compound;
• wherein the third compound comprises at least one element selected from the group consisting of D, F, CN, Si, Ge, P, B, and Se.

The OLED of claim 2, wherein phosphorescent capable material is selected from the group consisting of:

• wherein
• each of X96 to X99 is independently C or N;
• each Y100 is independently selected from the group consisting of a NR″, O, S, and Se;
• each of R10a, R20a, R30a, R40a, and R50a independently represents mono substitution, up to the maximum substitutions, or no substitution;
• L is independently selected from the group consisting of a direct bond, BR″, BR″R′″, NR″, PR″, O, S, Se, C═O, C═S, C═Se, C═NR″, C═CR″R′″, S═O, SO2, CR″, CR″R′″, SiR″R′″, GeR″R′″, alkyl, cycloalkyl, aryl, heteroaryl, and combinations thereof;
• X100 for each occurrence is selected from the group consisting of O, S, Se, NR″, and CR″R′″;
• each RA″, RB″, RC″, RD″, RE″, and RF″ independently represents mono-, up to the maximum substitutions, or no substitutions;
• each of R, R′, R″, R′″, R10a, R11a, R12a, R13a, R20a, R30a, R40a, R50a, R60, R70, R97, R98, R99, RA1′, RA2′, RA″, RB″, RC″, RD″, RE″, RF″, RG″, RH″, RI″, RJ″, RK″, RL″, RM″, and RN″ is independently a hydrogen or a substituent selected from the group consisting of deuterium, halogen, alkyl, cycloalkyl, heteroalkyl, heterocycloalkyl, arylalkyl, alkoxy, aryloxy, amino, silyl, germyl, boryl, alkenyl, cycloalkenyl, heteroalkenyl, alkynyl, aryl, heteroaryl, acyl, carboxylic acid, ether, ester, nitrile, isonitrile, sulfanyl, selenyl, sulfinyl, sulfonyl, phosphino, and combinations thereof.

The OLED of claim 2, wherein the fluorescent compound comprises at least one of the chemical moieties selected from the group consisting of:

• wherein YF, YG, YH, and YI are each independently selected from the group consisting of BR, NR, PR, O, S, Se, C═O, S═O, SO2, BRR′, CRR′, SiRR′, and GeRR′;
• wherein XF and XG are each independently selected from the group consisting of C and N;
• and
• wherein RF, RG, R, and R′ are each independently a hydrogen or a substituent selected from the group consisting of deuterium, halogen, alkyl, cycloalkyl, heteroalkyl, heterocycloalkyl, arylalkyl, alkoxy, aryloxy, amino, silyl, germyl, boryl, alkenyl, cycloalkenyl, heteroalkenyl, alkynyl, aryl, heteroaryl, acyl, carboxylic acid, ether, ester, nitrile, isonitrile, sulfanyl, selenyl, sulfinyl, sulfonyl, phosphino, and combinations thereof.

The OLED of claim 2, wherein the fluorescent compound is selected from the group consisting of

• wherein YF1 to YF4 are each independently selected from O, S, and NRF1;
• wherein RF1, and R1S to R9S each independently represents from mono to maximum possible number of substitutions, or no substitution;
• wherein RF1, and R1S to R9S are each independently a hydrogen or a substituent selected from the group consisting of deuterium, halogen, alkyl, cycloalkyl, heteroalkyl, heterocycloalkyl, arylalkyl, alkoxy, aryloxy, amino, silyl, germyl, boryl, alkenyl, cycloalkenyl, heteroalkenyl, alkynyl, aryl, heteroaryl, acyl, carboxylic acid, ether, ester, nitrile, isonitrile, sulfanyl, selenyl, sulfinyl, sulfonyl, phosphino, and combinations thereof;
• and
• any two substituents can be joined or fused to form a ring.