Continuous Color-Tunable Light-Emitting Devices Based on Compositionally Graded Monolayer Transition Metal Dichalcogenide Alloys

被引：16

作者：

Pu, Jiang ^{[1
]}

Ou, Hao ^{[1
]}

Yamada, Tomoyuki ^{[1
]}

Wada, Naoki ^{[2
]}

Naito, Hibiki ^{[2
]}

Ogura, Hiroto ^{[2
]}

Endo, Takahiko ^{[2
]}

Liu, Zheng ^{[3
]}

Irisawa, Toshifumi ^{[4
]}

Yanagi, Kazuhiro ^{[2
]}

Nakanishi, Yusuke ^{[2
]}

Gao, Yanlin ^{[5
]}

Maruyama, Mina ^{[5
]}

Okada, Susumu ^{[5
]}

Shinokita, Keisuke ^{[6
]}

Matsuda, Kazunari ^{[6
]}

Miyata, Yasumitsu ^{[2
]}

Takenobu, Taishi ^{[1
]}

机构：

[1] Nagoya Univ, Dept Appl Phys, Nagoya, Aichi 4648603, Japan

[2] Tokyo Metropolitan Univ, Dept Phys, Tokyo 1920397, Japan

[3] AIST, Innovat Funct Mat Res Inst, Nagoya, Aichi 4638560, Japan

[4] AIST, Device Technol Res Inst, Tsukuba, Ibaraki 3058562, Japan

[5] Univ Tsukuba, Dept Phys, Tsukuba, Ibaraki 3058571, Japan

[6] Kyoto Univ, Inst Adv Energy, Kyoto 6110011, Japan

来源：

ADVANCED MATERIALS | 2022年 / 34卷 / 44期

基金：

日本科学技术振兴机构; 日本学术振兴会;

关键词：

alloys; electroluminescence; ion gels; light-emitting devices; transition metal dichalcogenides; OPTICAL-PROPERTIES; PHOTOLUMINESCENCE; WS2; OPTOELECTRONICS; PHOTODETECTORS; PERFORMANCE; GROWTH;

D O I：

10.1002/adma.202203250

中图分类号：

O6 [化学];

学科分类号：

0703 ;

摘要：

The diverse series of transition metal dichalcogenide (TMDC) materials has been employed in various optoelectronic applications, such as photodetectors, light-emitting diodes, and lasers. Typically, the detection or emission range of optoelectronic devices is unique to the bandgap of the active material. Therefore, to improve the capability of these devices, extensive efforts have been devoted to tune the bandgap, such as gating, strain, and dielectric engineering. However, the controllability of these methods is severely limited (typically approximate to 0.1 eV). In contrast, alloying TMDCs is an effective approach that yields a composition-dependent bandgap and enables light emissions over a wide range. In this study, a color-tunable light-emitting device using compositionally graded TMDC alloys is fabricated. The monolayer WS2/WSe2 alloy grown by chemical vapor deposition shows a spatial gradient in the light-emission energy, which varies from 2.1 to 1.7 eV. This alloy is incorporated in an electrolyte-based light-emitting device structure that can tune the recombination zone laterally. Thus, a continuous and reversible color-tunable light-emitting device is successfully fabricated by controlling the light-emitting positions. The results provide a new approach for exploring monolayer semiconductor-based broadband optical applications.

引用

页数：10