Blue-light activated green emitting BaY2Al2Ga2SiO12:Ce3+, Bi3+: efficient persistent luminescence phosphors for AC-LEDs. Issue 4 (5th January 2023)

• Record Type: Journal Article
• Authors: Yuan, Weihong; Pang, Ran; Wang, Shangwei; Tan, Tao; Su, Jiangyue; Chen, Xuexia; Liu, Ruize; Li, Chengyu; Zhang, Su; Zhang, Hongjie
• Is Part Of: Inorganic chemistry frontiers. Volume 10:Issue 4(2023
• Page Start: 1203
• Page End: 1214
• Publication Date: 2023-01-05
• Subjects: Chemistry, Inorganic -- Periodicals; 546.05
• DOI: 10.1039/d2qi02349k
• Languages: English
• ISSNs: 2052-1553

Abstract

Abstract : An efficient blue-light excited green-emitting persistent luminescence phosphor, BaY2 Al2 Ga2 SiO12 :Ce 3+, Bi 3+, is designed and synthesized to effectively compensate for the flicker effect of AC-LEDs. Abstract : The advent of alternating current light-emitting diodes (AC-LEDs) based on persistent luminescence (PersL) phosphors is a major breakthrough in terms of long service lifetime, reduced production cost, and high energy utilization efficiency. However, the efficiency of the current PersL based AC-LEDs for flicker reduction in each AC cycle needs to be improved. To address this issue, herein, we develop a series of green-emitting persistent luminescence (PersL) phosphors BaY2 Al2 Ga2 SiO12 :Ce 3+, Bi 3+ (BYAGSO:Ce 3+, Bi 3+ ) via a defect engineering approach, whose PersL can be efficiently activated by blue-light. A strategy that introduces bismuth with multivalent states into BYAGSO:0.04Ce 3+ is proposed to optimize the PersL intensity. The τ 80 value (the time when the PersL intensity reaches 80% of its initial value) of BYAGSO:0.04Ce 3+, 0.01Bi 3+ is about 30 ms, which demonstrates its effectiveness in minimizing flicker from AC-LEDs. Meanwhile, with the aid of excitation temperature-dependent and fading thermoluminescence (TL) experiments, the trapping levels related to Bi 3+ in BYAGSO:Ce 3+, Bi 3+ are also investigated through the initial rise method. Furthermore, we fabricate an AC-LED device using the phosphor BYAGSO:0.04Ce 3+, 0.01Bi 3+ and the commercial red PersL phosphor Sr0.75 Ca0.25 S:Eu 2+ (SCS:Eu 2+ ) with an InGaN blue-emitting chip, which shows warm-white emission with a reduced percent flicker of 47.06%. These results demonstrate that the BYAGSO:Ce 3+, Bi 3+ phosphor might be a promising candidate for low-flicker AC-LEDs.