Multifunctional Deep‐Blue Emitter Comprising an Anthracene Core and Terminal Triphenylphosphine Oxide Groups

Abstract

A highly efficient blue‐light emitter, 2‐tert‐butyl‐9,10‐bis[4′‐(diphenyl‐phosphoryl)phenyl]anthracene (POAn) is synthesized, and comprises electron‐deficient triphenylphosphine oxide side groups appended to the 9‐ and 10‐positions of a 2‐tert‐butylanthracene core. This sophisticated anthracene compound possesses a non‐coplanar configuration that results in a decreased tendency to crystallize and weaker intermolecular interactions in the solid state, leading to its pronounced morphological stability and high quantum efficiency. In addition to serving as an electron‐transporting blue‐light‐emitting material, POAn also facilitates electron injection from the Al cathode to itself. Consequently, simple double‐layer devices incorporating POAn as the emitting, electron‐transporting, and ‐injecting material produce bright deep‐blue lights having Commission Internationale de L'Eclairage coordinates of (0.15,0.07). The peak electroluminescence performance was 4.3% (2.9 cd A−1). For a device lacking an electron‐transport layer or alkali fluoride, this device displays the best performance of any such the deep‐blue organic light‐emitting diodes reported to date.

Efficient and stable non-doped deep-blue organic light emitting diode based on an anthracene derivative

“…The absorption spectrum exhibits the characteristic vibration patterns of the isolated anthracene group at 336, 356, 375 and 397 nm [9,10]. The strong absorption band at 260 nm can be assigned to the aryl groups at the 9-and 10-positions of the anthracene core.…”

“…The deeper the blue color (smaller CIE y-value) is, the lower the power consumption of the device is. Recently, several deep-blue OLEDs with the 1931 CIE coordinates close to the NTSC standard have been reported [7][8][9][10][11][12][13][14][15], but the OLEDs with the coordinate of y < 0.05 are still rare [16,17].…”

“…Thus, they have been widely used as deep-blue emitting materials in OLEDs [7,9,15,[18][19][20]. In this paper, we report a novel anthracene derivative 9,10-bis[3,5-di(4-tertbutylphenyl)phenyl]anthracene (BPPA).…”

Highly efficient undoped deep-blue electroluminescent device based on a novel pyrene derivative

“…Thus, developing undoped blue emitters continues to receive considerable attention. Although several undoped blue emitters have been reported [3,[10][11][12][13][14][15][16], the performance of them is not satisfactory, accordingly, new undoped blue emitters are still required. Compared to other types of blue emitters, such as anthracene derivatives, pyrene derivatives have not studied extensively in OLEDs field.…”

Novel carbazole dendronized oligofluorenes for solution-processed organic light-emitting diodes

“…Compared to green light-emitting materials, much effort is still needed to further improve the performance of blue light-emitting materials, particularly in terms of luminescent efficiency and color purity [3e5]. Excellent blue emitting materials are more significant, not only as blue emitters, but also as hosts for lowerenergy emitters to facilitate efficient white and other color light emission [6,7]. Therefore, continuous efforts have been devoted to high-performance blue light-emitting materials with good stability.…”