The present invention relates to novel light-emitting materials. These materials comprise a non-aromatic spiro polycyclic group. This new side chain could reduce the stacking of the light-emitting materials and result in high PLQY.

The present invention relates to a hole transporting material having a structure of formula (I). (1) The present invention provides a hole transporting material having at least one benzene ring with non-hydrogen substituent(s) in the formula and being capable of obtaining a suitable mobility rate without occurrence of crosstalk between pixels. (2) The hole transporting material provided by the present invention is capable of satisfying the requirements on MASK cleaning in terms of solubility (NMP solvent).

The present invention relates to a hole transporting material having a structure of formula (I). The present invention provides a hole transporting material having at least one saturated six-membered carbon ring and benzene ring(s) having non-hydrogen substituent(s) in the formula and being capable of obtaining a suitable mobility rate without occurrence of crosstalk between pixels; and the hole transporting material provided by the present invention is capable of satisfying the requirements on MASK cleaning in terms of solubility (NMP solvent).

It is an object to provide a flexible light-emitting device with long lifetime in a simple way and to provide an inexpensive electronic device with long lifetime using the flexible light-emitting device. A flexible light-emitting device is provided, which includes a substrate having flexibility and a light-transmitting property with respect to visible light; a first adhesive layer over the substrate; an insulating film containing nitrogen and silicon over the first adhesive layer; a light-emitting element including a first electrode, a second electrode facing the first electrode, and an EL layer between the first electrode and the second electrode; a second adhesive layer over the second electrode; and a metal substrate over the second adhesive layer, wherein the thickness of the metal substrate is 10 μm to 200 μm inclusive. Further, an electronic device using the flexible light-emitting device is provided.

An organic light emitting diode and an organic light emitting display apparatus using the organic light emitting diode are provided. The organic light emitting diode includes a first electrode; a second electrode; and an organic layer between the first electrode and the second electrode to emit white light, and the organic layer is configured to emit white light in which an X-axis coordinate value in a color coordinate system is equal to or greater than 0.29, a Y-axis coordinate value in the color coordinate system is in a range of 0.32 to 0.45, and the Y-axis coordinate value in the color coordinate system is equal to or greater than the X-axis coordinate value in the color coordinate system.

An organic electroluminescent element including at least three light-emitting units. The at least three light-emitting units include one or more short-wavelength light-emitting units having a weighted average emission wavelength λ.sub.S of 380 or more and less than 550 nm, and two or more long-wavelength light-emitting units having a weighted average emission wavelength λ.sub.S of 550 nm or more and 780 nm or less. The two or more long-wavelength light-emitting units are greater in number than the one or more short-wavelength light-emitting units.

Embodiments of the present disclosure disclose an organic light-emitting display panel and an organic light-emitting display device. The organic light-emitting display panel includes: a substrate; a first electrode and a second electrode that are stacked, wherein the first electrode and the second electrode are both located on the same side of the substrate; an organic light-emitting layer, which is located between the first electrode and the second electrode; an electron transport layer, which is located between the organic light-emitting layer and the second electrode; wherein, a rare earth transitional metal is also contained at any location between the surface of the second electrode away from the organic light-emitting layer and the surface of the electron transport layer near to the organic light-emitting layer.

The present invention relates to a light-emitting layer B comprising a first emitter compound (a) having a non-exited state S0(a), a first excited singlet state S1(a) and a first excited triplet state T1(a); a second emitter compound (b) having a non-exited state S0(b), a first excited singlet state S1(b) and a first excited triplet state T1(b), wherein the energy level of S1(a) is higher than that of S1(b), the energy level of S1(b) is higher than that of T1(b) and wherein the rate of reverse intersystem crossing from T1(a) to S1(a) is higher than the rate of excition energy transfer from S1(a) to S1(b) and/or the rate of excition energy transfer from T1(a) to T1(b), and/or wherein the energy level of T1(b) is higher than that of T1(a). Further, the present invention also refers to an opto-electronic device comprising such light-emitting layer B and use thereof.

An organic light-emitting diode (OLED) display panel and an OLED display apparatus are provided. The OLED display panel comprises: a substrate; a first electrode and a second electrode disposed in a stacked configuration and on a same side of the substrate; an organic luminescent layer disposed between the first electrode and the second electrode; and an electron transport layer, disposed between the organic luminescent layer and the second electrode and including a predetermined volume percentage of element ytterbium (Yb).

A light-emitting device includes a first light-emitting element, a phosphor, and a second light-emitting element having a peak wavelength between peak wavelengths of two peaks that define a deepest dip in a composite emission spectrum of the first light-emitting element and the phosphor.