Abstract: In an embodiment, a carbazole derivative is provided. The carbazole derivative has formula (I): In formula (I), Ar1 and Ar2 are, independently, substituted or unsubstituted phenyl, naphthalenyl or heteroaryl containing nitrogen, oxygen or sulfur, and R is hydrogen, methyl or t-butyl. In another embodiment, an organic light emitting diode including the carbazole derivative is provided.

Abstract: A pixel structure of electroluminescent display panel has a first sub-pixel region, a second sub-pixel region and a third sub-pixel region. The pixel structure of electroluminescent display panel includes a first organic light-emitting layer and a second organic light-emitting layer. The first organic light-emitting layer, which includes a first organic light-emitting material, is disposed at least in the first sub-pixel region and the second sub-pixel region. The second organic light-emitting layer, which includes a second organic light-emitting material and a third organic light-emitting material, is disposed at least in the second sub-pixel region and the third sub-pixel region. The first organic light-emitting layer and the second organic light-emitting layer overlap in the second sub-pixel region. The first sub-pixel region and the third sub-pixel region have different cavity lengths.

Abstract: A white organic light-emitting device is provided by the present invention. The white organic light-emitting device includes an anode, a hole transport layer, a first light-emitting layer, a second light-emitting layer, a third light-emitting layer, an electron transport layer and a cathode, wherein the second light-emitting layer is formed between the first and the third light-emitting layers, the emission wavelength of the second light-emitting layer is longer than that of the first and third light-emitting layers, and the host material of the first and third light-emitting layer are different. The white organic light-emitting device of the present invention is capable of effectively increasing the luminous efficiency, reducing operating voltage, and providing color stability.

Abstract: A pixel structure of an electroluminescent display panel includes a first sub-pixel region, a second sub-pixel region, a third sub-pixel region and a fourth sub-pixel region having different cavity lengths. The first sub-pixel region and the second sub-pixel region share a first organic light-emitting layer, which can generate a first primary color light in the first sub-pixel region, and a second primary color light in the second sub-pixel region. The third sub-pixel region and the fourth sub-pixel region share a second organic light-emitting layer, which can generate a third primary color light in the third sub-pixel region, and a fourth primary color light in the fourth sub-pixel region. The first primary color light, the second primary color light, the third primary color light and the fourth primary color light have different spectra of wavelength.

Abstract: In an embodiment, a carbazole derivative is provided. The carbazole derivative has formula (I): In formula (I), Ar1 and Ar2 are, independently, substituted or unsubstituted phenyl, naphthalenyl or heteroaryl containing nitrogen, oxygen or sulfur, and R is hydrogen, methyl or t-butyl. In another embodiment, an organic light emitting diode including the carbazole derivative is provided.

Abstract: A white organic light-emitting device is provided by the present invention. The white organic light-emitting device includes an anode, a hole transport layer, a first light-emitting layer, a second light-emitting layer, a third light-emitting layer, an electron transport layer and a cathode, wherein the second light-emitting layer is formed between the first and the third light-emitting layers, the emission wavelength of the second light-emitting layer is longer than that of the first and third light-emitting layers, and the host material of the first and third light-emitting layer are different. The white organic light-emitting device of the present invention is capable of effectively increasing the luminous efficiency, reducing operating voltage, and providing color stability.

Abstract: An organometallic complex. The organometallic complex has formula (I): wherein A1 is a substituted or non-substituted aromatic heterocyclic group, A2 is a substituted or non-substituted aryl group, A3 is an acetylacetone group or picolinic acid group, and X is selected from the group consisting of fluorine atom, trifluoromethyl, alkoxy, thioalkyl, and amino. The invention also provides an organic electroluminescent device utilizing the organometallic complex.

Abstract: An organometallic complex is provided. The organometallic complex is selected from the group consisting of and wherein C is an acetyl acetone group or picolinic acid group m is 1˜3, n is 0˜3 and m+n=3, wherein D, E and G are the same or different and selected from the group consisting of H, halogen atoms, trifluoromethyl, C1-20 alkyl, C1-20 alkyl halide, C3-10 aryl and C3-20 heterocyclic ring containing O, N or S.

Abstract: An organometallic complex. The organometallic complex has formula (I): wherein A1 is a substituted or non-substituted aromatic heterocyclic group, A2 is a substituted or non-substituted aryl group, A3 is an acetylacetone group or picolinic acid group, and X is selected from the group consisting of fluorine atom, trifluoromethyl, alkoxy, thioalkyl, and amino. The invention also provides an organic electroluminescent device utilizing the organometallic complex.

Abstract: An organometallic complex. The organometallic complex has formula (I): wherein M is a transition metal comprising Ir, Pt, Pd, or Rh, A is a C3-20 aryl, C3-20 cycloalkyl, or C3-20 heterocyclic ring containing O, N, or S, R1˜R4 are the same or different and comprise H, halogen atoms, trifluoromethyl, C1-10 alkyl, C3-10 aryl, C3-10 cycloalkyl, or C3-10 heterocyclic ring containing O, N, or S, C is an acetyl acetone group or picolinic acid group wherein D, E, and F are the same or different and comprise H, halogen atoms, trifluoromethyl, C1-20 alkyl, C1-20 alkyl halide, C3-10 aryl, or C3-20 heterocyclic ring containing O, N, or S, and when M is Ir or Rh, m is 1˜3, n is 0˜3, and m+n=3 and when M is Pt or Pd, m is 1˜2, n is 0˜2, and m+n=2. The invention also provides an organic electroluminescent device utilizing the organometallic complex.