The patent badge is an abbreviated version of the USPTO patent document. The patent badge does contain a link to the full patent document.
The patent badge is an abbreviated version of the USPTO patent document. The patent badge covers the following: Patent number, Date patent was issued, Date patent was filed, Title of the patent, Applicant, Inventor, Assignee, Attorney firm, Primary examiner, Assistant examiner, CPCs, and Abstract. The patent badge does contain a link to the full patent document (in Adobe Acrobat format, aka pdf). To download or print any patent click here.
Patent No.:
Date of Patent:
Feb. 20, 2024
Filed:
Mar. 04, 2022
Merck Patent Gmbh, Darmstadt, DE;
Kenichi Tabata, Inagi, JP;
Yuta Nakamura, Hino, JP;
Taketo Namikawa, Hachioji, JP;
Satoru Inoue, Kunitachi, JP;
Yasuo Miyata, Yokohama, JP;
Hiromoto II, Machida, JP;
MERCK PATENT GMBH, Darmstadt, DE;
Abstract
A luminescent film includes a host compound, a blue phosphorescent compound, and a blue fluorescent compound, in which an emission spectrum of the blue phosphorescent compound and an absorption spectrum of the blue fluorescent compound have portions overlapping with each other; shortest wavelength-side maximum emission wavelengths of the blue phosphorescent compound (abbreviated as 'BPM' in the expression) and the blue fluorescent compound (abbreviated as “BFM” in the expression) satisfy the following expression (1): λ≥λ: expression (1) in which λrepresents the shortest wavelength-side maximum emission wavelength of the blue fluorescent compound and λrepresents the shortest wavelength-side maximum emission wavelength of the blue phosphorescent compound; and light emission derived from the blue fluorescent compound is detected.