Polymer-Based Blue Electrophosphorescent Light-Emitting Diodes Using a Bisorthometalated Ir(III) Complex as the Triplet Emitter
详细信息 查看全文
- 作者：Chang-Lyoul Lee ; Rupasree Ragini Das ; and Jang-Joo Kim
- 刊名：Chemistry of Materials
- 出版年：2004
- 出版时间：November 16, 2004
- 年：2004
- 卷：16
- 期：23
- 页码：4642 - 4646
- 全文大小：151K
- 年卷期：v.16,no.23(November 16, 2004)
- ISSN：1520-5002
文摘
Polymer-based blue electrophosphorescent light-emitting diodes are reported by dopingbisorthometalated (phosphine)cyanoiridium(III) complex Ir(ppy)2P(n-Bu)3CN (ppy = 2-phenylpyridine, P(n-Bu)3 = tri-n-butylphosphine) in poly(vinylcarbazole) (PVK) as the source ofemission. The (phosphine)cyanoiridium(III) complex shows sky blue emission with two peaksat 467 and 496 nm originating from an admixture of triplet metal-to-ligand charge-transferand ligand-centered states. The PL and EL spectra of an Ir(ppy)2P(n-Bu)3CN-doped PVKfilm and device exhibited no emission from PVK, indicating that the energy transfer fromPVK to Ir(ppy)2P(n-Bu)3CN is efficient. A maximum external quantum efficiency (
ex) of1.45% and power efficiency (p) of 0.99 lm/W were achieved at 13 and 6 mA/cm2 at a 10 wt% doping concentration, respectively.
ex) of1.45% and power efficiency (p) of 0.99 lm/W were achieved at 13 and 6 mA/cm2 at a 10 wt% doping concentration, respectively.