Light-emitting device, display device, electronic device, organic compound, and lighting device

A light-emitting device comprising:

• a pair of electrodes;
• and
• a light-emitting layer between the pair of electrodes,
• wherein the light-emitting layer contains a first material capable of converting triplet excitation energy into light emission, a second material capable of converting singlet excitation energy into light emission, and a third material capable of converting triplet excitation energy into light emission,
• wherein the second material contains a luminophore and four protecting groups,
• wherein the luminophore is a condensed aromatic ring or a condensed heteroaromatic ring,
• wherein the four protecting groups are not directly bonded to the condensed aromatic ring or the condensed heteroaromatic ring,
• wherein the four protecting groups each independently include any one of an alkyl group having 3 to 10 carbon atoms, a substituted or unsubstituted cycloalkyl group having 3 to 10 carbon atoms, and a trialkylsilyl group having 3 to 12 carbon atoms,
• wherein a lowest triplet excitation energy level (T1 level) of the first material is higher than the T1 level of the third material, and
• wherein light emission is obtained from both the second material and the third material.

A light-emitting device comprising:

• a pair of electrodes;
• and
• a light-emitting layer between the pair of electrodes,
• wherein the light-emitting layer contains a first material capable of converting triplet excitation energy into light emission, a second material capable of converting singlet excitation energy into light emission, and a third material capable of converting triplet excitation energy into light emission,
• wherein the second material contains a luminophore and two or more diarylamino groups,
• wherein the luminophore is a condensed aromatic ring or a condensed heteroaromatic ring,
• wherein the two or more diarylamino groups are bonded to the condensed aromatic ring or the condensed heteroaromatic ring,
• wherein aryl groups in the two or more diarylamino groups each independently have at least one protecting group,
• wherein the at least one protecting group of each of the two or more diarylamino groups independently includes any one of an alkyl group having 3 to 10 carbon atoms, a substituted or unsubstituted cycloalkyl group having 3 to 10 carbon atoms, and a trialkylsilyl group having 3 to 12 carbon atoms,
• wherein a lowest triplet excitation energy level (T1 level) of the first material is higher than the T1 level of the third material, and
• wherein light emission is obtained from both the second material and the third material.