Realizing Green Phosphorescent Light-Emitting Materials from Rhenium(I) Pyrazolato Diimine Complexes
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- 作者：Sudhir Ranjan ; Shen-Yi Lin ; Kuo-Chu Hwang ; Yun Chi ; Wei-Li Ching ; Chao-Shiuan Liu ; Yu-Tai Tao ; Chin-Hsiung Chien ; Shie-Ming Peng ; and Gene-Hsiang Lee
- 刊名：Inorganic Chemistry
- 出版年：2003
- 出版时间：February 24, 2003
- 年：2003
- 卷：42
- 期：4
- 页码：1248 - 1255
- 全文大小：147K
- 年卷期：v.42,no.4(February 24, 2003)
- ISSN：1520-510X
文摘
Two neutral pyrazolato diimine rhenium(I) carbonyl complexes with formula [Re(CO)3(N-N)(btpz)] where N-N =2,2'-bipyridine (1) and 1,10-phenanathroline (2), and btpz = 3,5-bis(trifluoromethyl) pyrazolate, were synthesizedand characterized by elemental analysis, routine spectroscopic methods, and single-crystal X-ray diffraction study.Ground and excited state properties of these complexes were investigated by steady-state and time-resolvedspectroscopies. Complexes 1 and 2 show photoluminescent emission in both solution and solid-state at roomtemperature, arising from metal to ligand charge-transfer (MLCT) transition with strong overlapping of intraligand
* transitions. The long-lived excited state lifetimes of complexes 1 and 2, which are on the order ofmicroseconds, indicate the presence of phosphorescent emission. As these complexes hold the potential to serveas phosphors for organic light-emitting diodes (OLEDs), their electroluminescent performances were evaluated byemploying them as dopants of various electron transport layer (ETL) or hole transport layer (HTL) hosts. Forcomplex 1, a green electrophosphorescence emission centered at 
max = 530 nm was observed at low turn-onvoltage (~6 V) with luminous power efficiency of 0.72 lm/W, external quantum efficiency of 0.82%, and luminanceof 2300 cd/m2 at a current density of 100 mA/cm2.
* transitions. The long-lived excited state lifetimes of complexes 1 and 2, which are on the order ofmicroseconds, indicate the presence of phosphorescent emission. As these complexes hold the potential to serveas phosphors for organic light-emitting diodes (OLEDs), their electroluminescent performances were evaluated byemploying them as dopants of various electron transport layer (ETL) or hole transport layer (HTL) hosts. Forcomplex 1, a green electrophosphorescence emission centered at max = 530 nm was observed at low turn-onvoltage (~6 V) with luminous power efficiency of 0.72 lm/W, external quantum efficiency of 0.82%, and luminanceof 2300 cd/m2 at a current density of 100 mA/cm2.