Carbazole-Dibenzofuran Dyads as Metal-Free Single-Component White-Color Photoemitters

被引：23

作者：

Tabata, Kenichi ^{[1
,2
,3
]}

Yamada, Tetsuya ^{[3
]}

Kita, Hiroshi ^{[3
,4
]}

Yamamoto, Yohei ^{[1
,2
]}

机构：

[1] Univ Tsukuba, Fac Pure & Appl Sci, Div Mat Sci, 1-1-1 Tennodai, Tsukuba, Ibaraki 3058573, Japan

[2] Univ Tsukuba, Tsukuba Res Ctr Energy Mat Sci TREMS, 1-1-1 Tennodai, Tsukuba, Ibaraki 3058573, Japan

[3] Konica Minolta Inc, 2970 Ishikawa, Hachioji, Tokyo 1928505, Japan

[4] Hiroshima Univ, Nat Sci Ctr Basic Res & Dev, 1-3-1 Kagamiyama, Higashihiroshima, Hiroshima 7398526, Japan

来源：

ADVANCED FUNCTIONAL MATERIALS | 2019年 / 29卷 / 03期

基金：

日本学术振兴会;

关键词：

carbazole; dibenzofuran; donor-acceptor dyad; photoluminescence; white-color OLED; LIGHT; LAYER; FRAMEWORK; EFFICIENT; DEVICES;

D O I：

10.1002/adfm.201805824

中图分类号：

O6 [化学];

学科分类号：

0703 ;

摘要：

White-color light emitters from single organic molecule without heavy metals are valuable for practical applications in organic light-emitting devices. In this study, carbazole (Cz)-dibenzofuran (DBF) donor-acceptor dyads are designed for white-color light emitters. Originally, these molecules show photoluminescence (PL) in near ultraviolet region. However, upon successive ultraviolet (UV) irradiation, white-color PL appears, comprising dual-color phosphorescence from the amorphous and crystalline state of the dyad. A continuous UV irradiation makes the twisting angle between the Cz and DBF planes flatten through the triplet-excited state, which proceeds crystallization. Thermal annealing and UV irradiation can switch the blue- and white-color phosphorescences from the dyad. Furthermore, charge injection generates white-color electroluminescence. The materials with PL color modulation ability by UV-light irradiation and heating can be applicable as light- and thermo-sensors.

引用

页数：6

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