Purely organic phosphorescent organic light emitting diodes using alkyl modified phenoselenazine

Abstract

Purely organic phosphorescent emitters have been developed with the incorporation of alkyl substituents into the N-phenylphenoselenazine core. The new emitter displayed efficient phosphorescence in amorphous film and featured pure phosphorescence...

Persistent room temperature phosphorescence films based on star-shaped organic emitters

“…6,36–42 However, the poor reproducibility, processability, and flexibility of these crystal-based materials will greatly hinder their further development. 14,43–45 Especially, the preparation of their thin films is always a critical and challenging task, while thin films with desirable optical properties are highly desired for many important practical applications. 14,43,46,47 In addition, in film states, the active vibration/diffusion motions of phosphors may quench the long-live triplet excitons.…”

3-(N,N-Diphenylamino)carbazole Donor Containing Bipolar Derivatives with Very High Glass Transition Temperatures as Potential TADF Emitters for OLEDs

“…MS (APCI + , 20 V): 550.12 ([M+H], 100%). 1 (8). 0.4 g (1.20 mmol) of compound 5 and 0.05 g (2.1 mmol) of 60% NaH was stirred in 10 mL of DMF under nitrogen for 30 min at room temperature.…”

“…Blue light emitting derivatives, particularly the pure organic materials with suitable light colour and high morphological stability, are very relevant in the OLEDs industry [1][2][3][4][5][6]. Earlier widely investigated phosphorescence metallic complexes and phosphorescent OLEDs contain noble metals, were environment-hazardous, and more expensive [7][8][9][10][11][12]. They especially suffer from stability of the devices and from not-satisfied light colours [13][14][15][16][17].…”

Efficient and tunable purely organic room temperature phosphorescence films from selenium-containing emitters achieved by structural isomerism

“…The development of metal-free purely organic room temperature phosphorescent (RTP) materials with long-lived triplet states and high phosphorescence efficiency has received increasing attention for their potential applications in biological imaging, 1–3 optical sensing, 4–6 anti-counterfeiting, 7–11 encryption, 12–14 and electroluminescence. 15–17 Although purely organic RTP materials possess the advantages of low toxicity and cost, facile synthesis and functionalization, and good processability compared to traditional organometallic complexes of heavy metals, 18–21 their intrinsically weak spin–orbit coupling (SOC) may slow down both the intersystem crossing (ISC) from the lowest excited singlet state (S 1 ) to the triplet states (T n ) and the radiative decay process of the emissive triplet states, which thus can be quenched easily by molecular motions (rotations and vibrations) or quenchers (oxygen and humidity). 22,23 To date, extensive efforts have been devoted to exploring efficient metal-free RTP materials.…”