High Mobility and Luminescent Efficiency in Organic Single‐Crystal Light‐Emitting Transistors

Abstract

A high‐performance ambipolar light‐emitting transistor (LET) that has high hole and electron mobilities and excellent luminescence characteristics is described. By using this device, a conspicuous light‐confined edge emission and current‐density‐dependent spectral evolution are observed. These findings will result in broader utilization of device potential and they provide a promising route for realizing electrically driven organic lasers.

Solution‐Processed Small‐Molecule Bulk Heterojunction Ambipolar Transistors

“…Organic CMOS technology requires the use of p-and n-type transistors on the same substrate; however, the separate vacuum-deposition of p-and n-type semiconductors increases the complexity of the circuit fabrication process. [ 7,8 ] To overcome this problem, researchers have explored several strategies, including: i) ambipolar OTFTs featuring symmetric or asymmetric source and drain electrodes for single organic semiconductors; [9][10][11][12] ii) bilayer structures consisting of hole-and electron-transporting organic compounds; [13][14][15][16] and iii) blending two organic semiconductors with different polarities to eliminate the need to pattern the p-and n-channel semiconductors in separation regions. [17][18][19][20] In a single-material confi guration, the effi cient injection of both holes and electrons is the key factor affecting the performance of ambipolar OTFTs.…”

Large gain for crystalline thin films of thiophene/phenylene co-oligomer by photopumping with femtosecond laser pulses

“…Organic single crystals are potentially useful for photonic and electronic devices because of their high carrier mobility and excellent emissive properties [1,2]. The unidirectional molecular alignment of the crystals results in effective optical confinement and band conductivity.…”

Equivalent ambipolar carrier injection of electrons and holes with Au electrodes in air-stable field effect transistors

“…According to these conditions, ambipolar carrier injection and transport are presently considered to be a universal phenomenon in organic semiconductors, [8][9][10][11][12][13][14][15][16][17][18][19][20][21][22][23] and this efficient ambipolar action has opened an intriguing research area in organic light-emitting FETs (OLEFETs).…”

“…10,16,[18][19][20][21][22][23] Metals with low u m , however, are sensitive to oxygen and moisture, and therefore, devices containing Ca-Au hetero-electrodes cannot operate under ambient air conditions. Therefore, several attempts have been carried out in order to realize efficient ambipolar injection with Au electrodes.…”