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Description
TCI D3970 N,N'-Di-1-naphthyl-N,N'-diphenylbenzidine, more commonly known among researchers as NPB or NPD, is an electronic-grade organic material purified by sublimation. It belongs to the organic light-emitting diode (OLED) materials category and functions primarily as a hole transport material. Its core structure consists of a biphenyl framework carrying four aryl groups — two naphthyl and two phenyl — bonded to two triarylamine nitrogen atoms. This arrangement provides an efficient transport pathway for positive charge carriers within the thin-film layers of a device, which is why the compound has become one of the reference hole transport materials in device research.
The characteristics that make this material a laboratory standard in OLED work are its ability to form smooth, uniform amorphous layers by thermal evaporation under vacuum, its good morphological stability, and its adequate hole mobility. The bulky naphthyl groups hinder crystallization of the thin film, so devices are more resistant to structural degradation during operation. The "purified by sublimation" designation indicates that the material has undergone the advanced purification normally required for device fabrication, since even trace impurities can act as charge traps or quenching sites and compromise the performance and reproducibility of the finished device.
In Indonesian laboratories, this material is typically used in university and institutional research groups working on organic electronics, thin-film devices, and display technology. It is handled in vacuum thermal evaporation systems within glove boxes or cleanroom facilities, where hole transport layers are deposited onto substrates as part of multilayer device stacks. It also serves as a reference material when research teams compare newly synthesized hole transport candidates against an established benchmark, and in graduate-level work on device physics and charge transport characterization.
Laboratory Applications
- Hole transport layer deposition — the material is evaporated under vacuum to form the layer that carries positive charge carriers from the anode side toward the emissive region of an OLED stack.
- Multilayer OLED device fabrication — its ability to form smooth, uniform amorphous films makes it suitable for building the sequential layers required in research-scale organic light-emitting diode prototypes.
- Benchmark reference material — research groups developing new hole transport compounds use this well-characterized, widely reported material as the comparison standard when evaluating device performance.
- Charge transport and device physics studies — the compound supports investigations of hole mobility, carrier injection behaviour, and interface effects in organic thin-film structures under controlled conditions.
- Thin-film morphology and stability research — the bulky naphthyl substituents that suppress crystallization make it a useful subject for studies of amorphous film stability and operational degradation.
Specifications
- Brand: TCI
- CAS number: 123847-85-8
- Category: Materials Science > Electronic Materials > Organic Light-Emitting Diode (OLED) Materials
- Chemical name: N,N'-Di-1-naphthyl-N,N'-diphenylbenzidine (NPB / NPD)
- Grade: purified by sublimation, electronic-grade organic material for device fabrication
- Pack sizes: available in standard TCI catalogue pack sizes; please confirm the required quantity when ordering
- Storage: keep in the original tightly closed container, protected from light and moisture
Handling and Storage
Store the material in its original tightly closed container in a cool, dry place, protected from light and moisture, since sublimation-purified electronic-grade materials are sensitive to contamination that can degrade device performance. Use clean, dedicated spatulas and glassware to avoid cross-contamination, and where possible transfer the material inside a glove box or a dry, controlled environment before loading it into evaporation crucibles. Handle the solid powder in a fume hood or well-ventilated area to prevent inhalation of dust, and wear standard laboratory personal protective equipment including gloves, safety glasses, and a laboratory coat. Reseal the container promptly after use, keep it clearly labelled, and consult the manufacturer's safety data sheet before handling and for disposal of residues.
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